102909831 has 8 divisors (see below), whose sum is σ = 137443824. Its totient is φ = 68491200.

The previous prime is 102909803. The next prime is 102909847. The reversal of 102909831 is 138909201.

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

It is not a de Polignac number, because 102909831 - 2⁵ = 102909799 is a prime.

It is a super-2 number, since 2×102909831² = 21180866632897122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 102909792 and 102909801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102909881) 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, 26736 + ... + 30341.

It is an arithmetic number, because the mean of its divisors is an integer number (17180478).

Almost surely, 2^102909831 is an apocalyptic number.

102909831 is a deficient number, since it is larger than the sum of its proper divisors (34533993).

102909831 is an equidigital number, since it uses as much as digits as its factorization.

102909831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57681.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 102909831 is about 10144.4482846530. The cubic root of 102909831 is about 468.6179879277.

It can be divided in two parts, 102909 and 831, that added together give a triangular number (103740 = T₄₅₅).

The spelling of 102909831 in words is "one hundred two million, nine hundred nine thousand, eight hundred thirty-one".