102111931 has 2 divisors, whose sum is σ = 102111932. Its totient is φ = 102111930.

The previous prime is 102111901. The next prime is 102111959. The reversal of 102111931 is 139111201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 102111931 - 2¹⁹ = 101587643 is a prime.

It is a super-2 number, since 2×102111931² = 20853692905097522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 102111899 and 102111908.

It is not a weakly prime, because it can be changed into another prime (102111901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51055965 + 51055966.

It is an arithmetic number, because the mean of its divisors is an integer number (51055966).

Almost surely, 2^102111931 is an apocalyptic number.

102111931 is a deficient number, since it is larger than the sum of its proper divisors (1).

102111931 is an equidigital number, since it uses as much as digits as its factorization.

102111931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 19.

The square root of 102111931 is about 10105.0448291930. The cubic root of 102111931 is about 467.4037183402.

The spelling of 102111931 in words is "one hundred two million, one hundred eleven thousand, nine hundred thirty-one".