121161056431 has 2 divisors, whose sum is σ = 121161056432. Its totient is φ = 121161056430.

The previous prime is 121161056407. The next prime is 121161056519. The reversal of 121161056431 is 134650161121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121161056431 is a prime.

It is a super-2 number, since 2×121161056431² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121161056393 and 121161056402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121161056131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60580528215 + 60580528216.

It is an arithmetic number, because the mean of its divisors is an integer number (60580528216).

Almost surely, 2^121161056431 is an apocalyptic number.

121161056431 is a deficient number, since it is larger than the sum of its proper divisors (1).

121161056431 is an equidigital number, since it uses as much as digits as its factorization.

121161056431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 31.

The spelling of 121161056431 in words is "one hundred twenty-one billion, one hundred sixty-one million, fifty-six thousand, four hundred thirty-one".