51501515 has 16 divisors (see below), whose sum is σ = 66836448. Its totient is φ = 37871616.

The previous prime is 51501503. The next prime is 51501539. The reversal of 51501515 is 51510515.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 51501515 - 2⁸ = 51501259 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15164 + ... + 18246.

It is an arithmetic number, because the mean of its divisors is an integer number (4177278).

Almost surely, 2^51501515 is an apocalyptic number.

51501515 is a deficient number, since it is larger than the sum of its proper divisors (15334933).

51501515 is a wasteful number, since it uses less digits than its factorization.

51501515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3358.

The product of its (nonzero) digits is 625, while the sum is 23.

The square root of 51501515 is about 7176.4556014790. The cubic root of 51501515 is about 372.0545912676.

The spelling of 51501515 in words is "fifty-one million, five hundred one thousand, five hundred fifteen".