121751558431 has 2 divisors, whose sum is σ = 121751558432. Its totient is φ = 121751558430.

The previous prime is 121751558417. The next prime is 121751558441. The reversal of 121751558431 is 134855157121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121751558431 - 2⁷ = 121751558303 is a prime.

It is a super-2 number, since 2×121751558431² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121751558441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60875779215 + 60875779216.

It is an arithmetic number, because the mean of its divisors is an integer number (60875779216).

Almost surely, 2^121751558431 is an apocalyptic number.

121751558431 is a deficient number, since it is larger than the sum of its proper divisors (1).

121751558431 is an equidigital number, since it uses as much as digits as its factorization.

121751558431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 168000, while the sum is 43.

The spelling of 121751558431 in words is "one hundred twenty-one billion, seven hundred fifty-one million, five hundred fifty-eight thousand, four hundred thirty-one".