787855251 has 4 divisors (see below), whose sum is σ = 1050473672. Its totient is φ = 525236832.

The previous prime is 787855241. The next prime is 787855279. The reversal of 787855251 is 152558787.

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

It is not a de Polignac number, because 787855251 - 2²⁶ = 720746387 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 787855251.

It is not an unprimeable number, because it can be changed into a prime (787855241) 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, 131309206 + ... + 131309211.

It is an arithmetic number, because the mean of its divisors is an integer number (262618418).

Almost surely, 2^787855251 is an apocalyptic number.

787855251 is a deficient number, since it is larger than the sum of its proper divisors (262618421).

787855251 is a wasteful number, since it uses less digits than its factorization.

787855251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262618420.

The product of its digits is 784000, while the sum is 48.

The square root of 787855251 is about 28068.7593420158. The cubic root of 787855251 is about 923.5962153669.

The spelling of 787855251 in words is "seven hundred eighty-seven million, eight hundred fifty-five thousand, two hundred fifty-one".