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231751456157 = 13139220358217
BaseRepresentation
bin1101011111010101110…
…1101001010110011101
3211011012011020210001002
43113311131221112131
512244111333044112
6254244250000045
722513005606014
oct3276535512635
9734164223032
10231751456157
118a315723161
1238ab9116025
1318b14508960
14b306da7a7b
156065c181c2
hex35f576959d

231751456157 has 16 divisors (see below), whose sum is σ = 251492445120. Its totient is φ = 212285342592.

The previous prime is 231751456091. The next prime is 231751456169. The reversal of 231751456157 is 751654157132.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-231751456157 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231751486157) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3951713 + ... + 4009929.

It is an arithmetic number, because the mean of its divisors is an integer number (15718277820).

Almost surely, 2231751456157 is an apocalyptic number.

It is an amenable number.

231751456157 is a deficient number, since it is larger than the sum of its proper divisors (19740988963).

231751456157 is a wasteful number, since it uses less digits than its factorization.

231751456157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60572.

The product of its digits is 882000, while the sum is 47.

The spelling of 231751456157 in words is "two hundred thirty-one billion, seven hundred fifty-one million, four hundred fifty-six thousand, one hundred fifty-seven".

Divisors: 1 13 139 1807 2203 28639 58217 306217 756821 3980821 8092163 105198119 128252051 1667276663 17827035089 231751456157