121108931 has 2 divisors, whose sum is σ = 121108932. Its totient is φ = 121108930.

The previous prime is 121108927. The next prime is 121108951. The reversal of 121108931 is 139801121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121108931 - 2² = 121108927 is a prime.

It is a super-2 number, since 2×121108931² = 29334746335925522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121108931.

It is not a weakly prime, because it can be changed into another prime (121108921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60554465 + 60554466.

It is an arithmetic number, because the mean of its divisors is an integer number (60554466).

Almost surely, 2^121108931 is an apocalyptic number.

121108931 is a deficient number, since it is larger than the sum of its proper divisors (1).

121108931 is an equidigital number, since it uses as much as digits as its factorization.

121108931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 26.

The square root of 121108931 is about 11004.9502952081. The cubic root of 121108931 is about 494.7571246696.

The spelling of 121108931 in words is "one hundred twenty-one million, one hundred eight thousand, nine hundred thirty-one".