51505115 has 4 divisors (see below), whose sum is σ = 61806144. Its totient is φ = 41204088.

The previous prime is 51505109. The next prime is 51505123. The reversal of 51505115 is 51150515.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51505115 is a prime.

It is a Duffinian 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, 5150507 + ... + 5150516.

It is an arithmetic number, because the mean of its divisors is an integer number (15451536).

Almost surely, 2^51505115 is an apocalyptic number.

51505115 is a deficient number, since it is larger than the sum of its proper divisors (10301029).

51505115 is a wasteful number, since it uses less digits than its factorization.

51505115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10301028.

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

The square root of 51505115 is about 7176.7064172920. The cubic root of 51505115 is about 372.0632600438.

The spelling of 51505115 in words is "fifty-one million, five hundred five thousand, one hundred fifteen".