512157709121 has 4 divisors (see below), whose sum is σ = 514150540932. Its totient is φ = 510164877312.

The previous prime is 512157709099. The next prime is 512157709127. The reversal of 512157709121 is 121907751215.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121907751215 = 5 ⋅24381550243.

It can be written as a sum of positive squares in 2 ways, for example, as 467452527025 + 44705182096 = 683705^2 + 211436^2 .

It is a cyclic number.

It is not a de Polignac number, because 512157709121 - 2²⁶ = 512090600257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (512157709127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 996415520 + ... + 996416033.

It is an arithmetic number, because the mean of its divisors is an integer number (128537635233).

Almost surely, 2^512157709121 is an apocalyptic number.

It is an amenable number.

512157709121 is a deficient number, since it is larger than the sum of its proper divisors (1992831811).

512157709121 is a wasteful number, since it uses less digits than its factorization.

512157709121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1992831810.

The product of its (nonzero) digits is 44100, while the sum is 41.

The spelling of 512157709121 in words is "five hundred twelve billion, one hundred fifty-seven million, seven hundred nine thousand, one hundred twenty-one".