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31187143621 = 311676024173
BaseRepresentation
bin11101000010111001…
…100000101111000101
32222111111010001021101
4131002321200233011
51002332402043441
622154400420101
72152563226654
oct350271405705
988444101241
1031187143621
1112254369667
126064617631
132c3030784a
14171bd8d19b
15c27e75231
hex742e60bc5

31187143621 has 8 divisors (see below), whose sum is σ = 32385959424. Its totient is φ = 30000376560.

The previous prime is 31187143619. The next prime is 31187143627. The reversal of 31187143621 is 12634178113.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31187143621 - 21 = 31187143619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31187143627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3006910 + ... + 3017263.

It is an arithmetic number, because the mean of its divisors is an integer number (4048244928).

Almost surely, 231187143621 is an apocalyptic number.

31187143621 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

31187143621 is a deficient number, since it is larger than the sum of its proper divisors (1198815803).

31187143621 is a wasteful number, since it uses less digits than its factorization.

31187143621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6024371.

The product of its digits is 24192, while the sum is 37.

The spelling of 31187143621 in words is "thirty-one billion, one hundred eighty-seven million, one hundred forty-three thousand, six hundred twenty-one".

Divisors: 1 31 167 5177 6024173 186749363 1006036891 31187143621