100978931 has 2 divisors, whose sum is σ = 100978932. Its totient is φ = 100978930.

The previous prime is 100978919. The next prime is 100978937. The reversal of 100978931 is 139879001.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 100978931 - 2²² = 96784627 is a prime.

It is a super-2 number, since 2×100978931² = 20393489011805522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (100978937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50489465 + 50489466.

It is an arithmetic number, because the mean of its divisors is an integer number (50489466).

Almost surely, 2^100978931 is an apocalyptic number.

100978931 is a deficient number, since it is larger than the sum of its proper divisors (1).

100978931 is an equidigital number, since it uses as much as digits as its factorization.

100978931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 100978931 is about 10048.8273445213. The cubic root of 100978931 is about 465.6685661742.

The spelling of 100978931 in words is "one hundred million, nine hundred seventy-eight thousand, nine hundred thirty-one".