51425901 has 32 divisors (see below), whose sum is σ = 81244800. Its totient is φ = 32037120.

The previous prime is 51425851. The next prime is 51425909. The reversal of 51425901 is 10952415.

It is not a de Polignac number, because 51425901 - 2²¹ = 49328749 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51425909) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 82770 + ... + 83388.

It is an arithmetic number, because the mean of its divisors is an integer number (2538900).

Almost surely, 2^51425901 is an apocalyptic number.

51425901 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

51425901 is a deficient number, since it is larger than the sum of its proper divisors (29818899).

51425901 is a wasteful number, since it uses less digits than its factorization.

51425901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 826 (or 820 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 51425901 is about 7171.1854668527. The cubic root of 51425901 is about 371.8724198300.

It can be divided in two parts, 51425 and 901, that added together give a triangular number (52326 = T₃₂₃).

The spelling of 51425901 in words is "fifty-one million, four hundred twenty-five thousand, nine hundred one".