51521015 has 16 divisors (see below), whose sum is σ = 76093248. Its totient is φ = 32610816.

The previous prime is 51520981. The next prime is 51521017. The reversal of 51521015 is 51012515.

It is a happy number.

It is not a de Polignac number, because 51521015 - 2¹⁰ = 51519991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51521017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56162 + ... + 57071.

It is an arithmetic number, because the mean of its divisors is an integer number (4755828).

Almost surely, 2^51521015 is an apocalyptic number.

51521015 is a deficient number, since it is larger than the sum of its proper divisors (24572233).

51521015 is a wasteful number, since it uses less digits than its factorization.

51521015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113258.

The product of its (nonzero) digits is 250, while the sum is 20.

The square root of 51521015 is about 7177.8140822955. The cubic root of 51521015 is about 372.1015423075.

The spelling of 51521015 in words is "fifty-one million, five hundred twenty-one thousand, fifteen".