51151615 has 8 divisors (see below), whose sum is σ = 61422768. Its totient is φ = 40894080.

The previous prime is 51151613. The next prime is 51151687. The reversal of 51151615 is 51615115.

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

It is not a de Polignac number, because 51151615 - 2¹ = 51151613 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51151615.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51151613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8935 + ... + 13495.

It is an arithmetic number, because the mean of its divisors is an integer number (7677846).

Almost surely, 2^51151615 is an apocalyptic number.

51151615 is a deficient number, since it is larger than the sum of its proper divisors (10271153).

51151615 is a wasteful number, since it uses less digits than its factorization.

51151615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6809.

The product of its digits is 750, while the sum is 25.

The square root of 51151615 is about 7152.0357241837. The cubic root of 51151615 is about 371.2100993671.

The spelling of 51151615 in words is "fifty-one million, one hundred fifty-one thousand, six hundred fifteen".