121532515939 has 2 divisors, whose sum is σ = 121532515940. Its totient is φ = 121532515938.

The previous prime is 121532515931. The next prime is 121532515961. The reversal of 121532515939 is 939515235121.

It is a weak prime.

It is an emirp because it is prime and its reverse (939515235121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121532515939 - 2³ = 121532515931 is a prime.

It is not a weakly prime, because it can be changed into another prime (121532515931) 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, 60766257969 + 60766257970.

It is an arithmetic number, because the mean of its divisors is an integer number (60766257970).

Almost surely, 2^121532515939 is an apocalyptic number.

121532515939 is a deficient number, since it is larger than the sum of its proper divisors (1).

121532515939 is an equidigital number, since it uses as much as digits as its factorization.

121532515939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 364500, while the sum is 46.

The spelling of 121532515939 in words is "one hundred twenty-one billion, five hundred thirty-two million, five hundred fifteen thousand, nine hundred thirty-nine".