765725121 has 12 divisors (see below), whose sum is σ = 1264054272. Its totient is φ = 437557176.

The previous prime is 765725083. The next prime is 765725159. The reversal of 765725121 is 121527567.

765725121 is a `hidden beast` number, since 76 + 5 + 72 + 512 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (765725083) and next prime (765725159).

It is not a de Polignac number, because 765725121 - 2¹⁰ = 765724097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (765725171) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6077121 + ... + 6077246.

It is an arithmetic number, because the mean of its divisors is an integer number (105337856).

Almost surely, 2^765725121 is an apocalyptic number.

It is an amenable number.

765725121 is a deficient number, since it is larger than the sum of its proper divisors (498329151).

765725121 is a wasteful number, since it uses less digits than its factorization.

765725121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12154380 (or 12154377 counting only the distinct ones).

The product of its digits is 29400, while the sum is 36.

The square root of 765725121 is about 27671.7386696246. The cubic root of 765725121 is about 914.8663031387.

The spelling of 765725121 in words is "seven hundred sixty-five million, seven hundred twenty-five thousand, one hundred twenty-one".