121631265731 has 2 divisors, whose sum is σ = 121631265732. Its totient is φ = 121631265730.

The previous prime is 121631265713. The next prime is 121631265781. The reversal of 121631265731 is 137562136121.

It is a happy number.

Together with previous prime (121631265713) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121631265731 - 2⁶ = 121631265667 is a prime.

It is a super-2 number, since 2×121631265731² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121631265781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60815632865 + 60815632866.

It is an arithmetic number, because the mean of its divisors is an integer number (60815632866).

Almost surely, 2^121631265731 is an apocalyptic number.

121631265731 is a deficient number, since it is larger than the sum of its proper divisors (1).

121631265731 is an equidigital number, since it uses as much as digits as its factorization.

121631265731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 38.

The spelling of 121631265731 in words is "one hundred twenty-one billion, six hundred thirty-one million, two hundred sixty-five thousand, seven hundred thirty-one".