51877731 has 4 divisors (see below), whose sum is σ = 69170312. Its totient is φ = 34585152.

The previous prime is 51877729. The next prime is 51877747. The reversal of 51877731 is 13777815.

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

It is not a de Polignac number, because 51877731 - 2¹ = 51877729 is a prime.

It is a super-2 number, since 2×51877731² = 5382597947416722, which contains 22 as substring.

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 51877731.

It is not an unprimeable number, because it can be changed into a prime (51877531) 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, 8646286 + ... + 8646291.

It is an arithmetic number, because the mean of its divisors is an integer number (17292578).

Almost surely, 2^51877731 is an apocalyptic number.

51877731 is a deficient number, since it is larger than the sum of its proper divisors (17292581).

51877731 is a wasteful number, since it uses less digits than its factorization.

51877731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17292580.

The product of its digits is 41160, while the sum is 39.

The square root of 51877731 is about 7202.6197317365. The cubic root of 51877731 is about 372.9583409595.

The spelling of 51877731 in words is "fifty-one million, eight hundred seventy-seven thousand, seven hundred thirty-one".