51500397 has 16 divisors (see below), whose sum is σ = 74245248. Its totient is φ = 31565760.

The previous prime is 51500389. The next prime is 51500399. The reversal of 51500397 is 79300515.

It is a happy number.

It is not a de Polignac number, because 51500397 - 2³ = 51500389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51500399) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7747 + ... + 12767.

It is an arithmetic number, because the mean of its divisors is an integer number (4640328).

Almost surely, 2^51500397 is an apocalyptic number.

It is an amenable number.

51500397 is a deficient number, since it is larger than the sum of its proper divisors (22744851).

51500397 is a wasteful number, since it uses less digits than its factorization.

51500397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5300.

The product of its (nonzero) digits is 4725, while the sum is 30.

The square root of 51500397 is about 7176.3777074510. The cubic root of 51500397 is about 372.0518990488.

The spelling of 51500397 in words is "fifty-one million, five hundred thousand, three hundred ninety-seven".