77725131 has 8 divisors (see below), whose sum is σ = 113054784. Its totient is φ = 47106120.

The previous prime is 77725097. The next prime is 77725157. The reversal of 77725131 is 13152777.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 77725131 - 2¹¹ = 77723083 is a prime.

It is a super-2 number, since 2×77725131² = 12082391977934322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 2355307 = 77725131 / (7 + 7 + 7 + 2 + 5 + 1 + 3 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 77725092 and 77725101.

It is not an unprimeable number, because it can be changed into a prime (77725171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1177621 + ... + 1177686.

It is an arithmetic number, because the mean of its divisors is an integer number (14131848).

Almost surely, 2^77725131 is an apocalyptic number.

77725131 is a deficient number, since it is larger than the sum of its proper divisors (35329653).

77725131 is a wasteful number, since it uses less digits than its factorization.

77725131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2355321.

The product of its digits is 10290, while the sum is 33.

The square root of 77725131 is about 8816.1857398764. The cubic root of 77725131 is about 426.7633879711.

The spelling of 77725131 in words is "seventy-seven million, seven hundred twenty-five thousand, one hundred thirty-one".