51719895 has 24 divisors (see below), whose sum is σ = 92073696. Its totient is φ = 26837568.

The previous prime is 51719869. The next prime is 51719897. The reversal of 51719895 is 59891715.

It is not a de Polignac number, because 51719895 - 2⁸ = 51719639 is a prime.

It is a super-2 number, since 2×51719895² = 5349895077622050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 51719895.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51719897) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13867 + ... + 17196.

It is an arithmetic number, because the mean of its divisors is an integer number (3836404).

Almost surely, 2^51719895 is an apocalyptic number.

51719895 is a deficient number, since it is larger than the sum of its proper divisors (40353801).

51719895 is a wasteful number, since it uses less digits than its factorization.

51719895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31111 (or 31108 counting only the distinct ones).

The product of its digits is 113400, while the sum is 45.

The square root of 51719895 is about 7191.6545384216. The cubic root of 51719895 is about 372.5797195863.

The spelling of 51719895 in words is "fifty-one million, seven hundred nineteen thousand, eight hundred ninety-five".