51552615 has 8 divisors (see below), whose sum is σ = 82484208. Its totient is φ = 27494720.

The previous prime is 51552593. The next prime is 51552629. The reversal of 51552615 is 51625515.

51552615 = 3209² + 3210² + ... + 3213².

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51552615 - 2⁹ = 51552103 is a prime.

It is a super-2 number, since 2×51552615² = 5315344226676450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1718406 + ... + 1718435.

It is an arithmetic number, because the mean of its divisors is an integer number (10310526).

Almost surely, 2^51552615 is an apocalyptic number.

51552615 is a deficient number, since it is larger than the sum of its proper divisors (30931593).

51552615 is a wasteful number, since it uses less digits than its factorization.

51552615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3436849.

The product of its digits is 7500, while the sum is 30.

The square root of 51552615 is about 7180.0149721292. The cubic root of 51552615 is about 372.1776019218.

Subtracting 51552615 from its reverse (51625515), we obtain a square (72900 = 270²).

The spelling of 51552615 in words is "fifty-one million, five hundred fifty-two thousand, six hundred fifteen".