121565760531 has 4 divisors (see below), whose sum is σ = 162087680712. Its totient is φ = 81043840352.

The previous prime is 121565760529. The next prime is 121565760541. The reversal of 121565760531 is 135067565121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121565760531 - 2¹ = 121565760529 is a prime.

It is a super-2 number, since 2×121565760531² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121565760541) 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 in 3 ways as a sum of consecutive naturals, for example, 20260960086 + ... + 20260960091.

It is an arithmetic number, because the mean of its divisors is an integer number (40521920178).

Almost surely, 2^121565760531 is an apocalyptic number.

121565760531 is a deficient number, since it is larger than the sum of its proper divisors (40521920181).

121565760531 is an equidigital number, since it uses as much as digits as its factorization.

121565760531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40521920180.

The product of its (nonzero) digits is 189000, while the sum is 42.

The spelling of 121565760531 in words is "one hundred twenty-one billion, five hundred sixty-five million, seven hundred sixty thousand, five hundred thirty-one".