51318415 has 4 divisors (see below), whose sum is σ = 61582104. Its totient is φ = 41054728.

The previous prime is 51318413. The next prime is 51318437. The reversal of 51318415 is 51481315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51481315 = 5 ⋅10296263.

It is a cyclic number.

It is not a de Polignac number, because 51318415 - 2¹ = 51318413 is a prime.

It is a super-2 number, since 2×51318415² = 5267159436224450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51318413) 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, 5131837 + ... + 5131846.

It is an arithmetic number, because the mean of its divisors is an integer number (15395526).

Almost surely, 2^51318415 is an apocalyptic number.

51318415 is a deficient number, since it is larger than the sum of its proper divisors (10263689).

51318415 is a wasteful number, since it uses less digits than its factorization.

51318415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10263688.

The product of its digits is 2400, while the sum is 28.

The square root of 51318415 is about 7163.6872488963. The cubic root of 51318415 is about 371.6131538534.

The spelling of 51318415 in words is "fifty-one million, three hundred eighteen thousand, four hundred fifteen".