51613905 has 24 divisors (see below), whose sum is σ = 96066432. Its totient is φ = 23594592.

The previous prime is 51613879. The next prime is 51613949. The reversal of 51613905 is 50931615.

It is not a de Polignac number, because 51613905 - 2⁵ = 51613873 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34377 + ... + 35846.

It is an arithmetic number, because the mean of its divisors is an integer number (4002768).

Almost surely, 2^51613905 is an apocalyptic number.

It is an amenable number.

51613905 is a deficient number, since it is larger than the sum of its proper divisors (44452527).

51613905 is a wasteful number, since it uses less digits than its factorization.

51613905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70245 (or 70238 counting only the distinct ones).

The product of its (nonzero) digits is 4050, while the sum is 30.

The square root of 51613905 is about 7184.2818012659. The cubic root of 51613905 is about 372.3250353185.

The spelling of 51613905 in words is "fifty-one million, six hundred thirteen thousand, nine hundred five".