121644931 has 2 divisors, whose sum is σ = 121644932. Its totient is φ = 121644930.

The previous prime is 121644923. The next prime is 121645019. The reversal of 121644931 is 139446121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121644931 - 2³ = 121644923 is a prime.

It is a super-2 number, since 2×121644931² = 29594978475989522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121644893 and 121644902.

It is not a weakly prime, because it can be changed into another prime (121647931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60822465 + 60822466.

It is an arithmetic number, because the mean of its divisors is an integer number (60822466).

Almost surely, 2^121644931 is an apocalyptic number.

121644931 is a deficient number, since it is larger than the sum of its proper divisors (1).

121644931 is an equidigital number, since it uses as much as digits as its factorization.

121644931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 31.

The square root of 121644931 is about 11029.2760868518. The cubic root of 121644931 is about 495.4859439039.

The spelling of 121644931 in words is "one hundred twenty-one million, six hundred forty-four thousand, nine hundred thirty-one".