51615055 has 4 divisors (see below), whose sum is σ = 61938072. Its totient is φ = 41292040.

The previous prime is 51615049. The next prime is 51615061. The reversal of 51615055 is 55051615.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55051615 = 5 ⋅11010323.

It is an interprime number because it is at equal distance from previous prime (51615049) and next prime (51615061).

It is not a de Polignac number, because 51615055 - 2¹¹ = 51613007 is a prime.

It is a super-2 number, since 2×51615055² = 5328227805306050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5161501 + ... + 5161510.

It is an arithmetic number, because the mean of its divisors is an integer number (15484518).

Almost surely, 2^51615055 is an apocalyptic number.

51615055 is a deficient number, since it is larger than the sum of its proper divisors (10323017).

51615055 is a wasteful number, since it uses less digits than its factorization.

51615055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10323016.

The product of its (nonzero) digits is 3750, while the sum is 28.

The square root of 51615055 is about 7184.3618366561. The cubic root of 51615055 is about 372.3278005333.

The spelling of 51615055 in words is "fifty-one million, six hundred fifteen thousand, fifty-five".