51428957 has 4 divisors (see below), whose sum is σ = 51465120. Its totient is φ = 51392796.

The previous prime is 51428911. The next prime is 51428959. The reversal of 51428957 is 75982415.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51428957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51428959) 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, 15857 + ... + 18822.

It is an arithmetic number, because the mean of its divisors is an integer number (12866280).

Almost surely, 2^51428957 is an apocalyptic number.

It is an amenable number.

51428957 is a deficient number, since it is larger than the sum of its proper divisors (36163).

51428957 is a wasteful number, since it uses less digits than its factorization.

51428957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36162.

The product of its digits is 100800, while the sum is 41.

The square root of 51428957 is about 7171.3985386394. The cubic root of 51428957 is about 371.8797858951.

The spelling of 51428957 in words is "fifty-one million, four hundred twenty-eight thousand, nine hundred fifty-seven".