102131685491 has 8 divisors (see below), whose sum is σ = 111460090368. Its totient is φ = 92810565000.

The previous prime is 102131685457. The next prime is 102131685499. The reversal of 102131685491 is 194586131201.

It is a happy number.

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 102131685491 - 2³⁴ = 84951816307 is a prime.

It is a super-2 number, since 2×102131685491² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (102131685499) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1791755 + ... + 1847876.

It is an arithmetic number, because the mean of its divisors is an integer number (13932511296).

Almost surely, 2^102131685491 is an apocalyptic number.

102131685491 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

102131685491 is a deficient number, since it is larger than the sum of its proper divisors (9328404877).

102131685491 is a wasteful number, since it uses less digits than its factorization.

102131685491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3642193.

The product of its (nonzero) digits is 51840, while the sum is 41.

The spelling of 102131685491 in words is "one hundred two billion, one hundred thirty-one million, six hundred eighty-five thousand, four hundred ninety-one".