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68135331 = 31115713151
BaseRepresentation
bin1000000111110…
…10100110100011
311202012122002210
410003322212203
5114420312311
610432213203
71455066165
oct403724643
9152178083
1068135331
11355080a0
121a99a203
1311167b84
149098935
155ead3a6
hex40fa9a3

68135331 has 16 divisors (see below), whose sum is σ = 99744768. Its totient is φ = 41028000.

The previous prime is 68135323. The next prime is 68135341. The reversal of 68135331 is 13353186.

It is not a de Polignac number, because 68135331 - 23 = 68135323 is a prime.

It is a super-2 number, since 2×681353312 = 9284846660959122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68135341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1395 + ... + 11756.

It is an arithmetic number, because the mean of its divisors is an integer number (6234048).

Almost surely, 268135331 is an apocalyptic number.

68135331 is a deficient number, since it is larger than the sum of its proper divisors (31609437).

68135331 is a wasteful number, since it uses less digits than its factorization.

68135331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13322.

The product of its digits is 6480, while the sum is 30.

The square root of 68135331 is about 8254.4128198195. The cubic root of 68135331 is about 408.4361025609.

Subtracting from 68135331 its sum of digits (30), we obtain a triangular number (68135301 = T11673).

The spelling of 68135331 in words is "sixty-eight million, one hundred thirty-five thousand, three hundred thirty-one".

Divisors: 1 3 11 33 157 471 1727 5181 13151 39453 144661 433983 2064707 6194121 22711777 68135331