51375881 has 4 divisors (see below), whose sum is σ = 51470352. Its totient is φ = 51281412.

The previous prime is 51375851. The next prime is 51375913. The reversal of 51375881 is 18857315.

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 not a de Polignac number, because 51375881 - 2¹⁸ = 51113737 is a prime.

It is a super-2 number, since 2×51375881² = 5278962297052322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51375811) 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, 46415 + ... + 47508.

It is an arithmetic number, because the mean of its divisors is an integer number (12867588).

Almost surely, 2^51375881 is an apocalyptic number.

It is an amenable number.

51375881 is a deficient number, since it is larger than the sum of its proper divisors (94471).

51375881 is an equidigital number, since it uses as much as digits as its factorization.

51375881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94470.

The product of its digits is 33600, while the sum is 38.

The square root of 51375881 is about 7167.6970499596. The cubic root of 51375881 is about 371.7518120417.

The spelling of 51375881 in words is "fifty-one million, three hundred seventy-five thousand, eight hundred eighty-one".