51531505 has 16 divisors (see below), whose sum is σ = 66873600. Its totient is φ = 37971712.

The previous prime is 51531451. The next prime is 51531511. The reversal of 51531505 is 50513515.

51531505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 51531505 - 2⁷ = 51531377 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51531505.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2455 + ... + 10444.

It is an arithmetic number, because the mean of its divisors is an integer number (4179600).

Almost surely, 2^51531505 is an apocalyptic number.

It is an amenable number.

51531505 is a deficient number, since it is larger than the sum of its proper divisors (15342095).

51531505 is a wasteful number, since it uses less digits than its factorization.

51531505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12968.

The product of its (nonzero) digits is 1875, while the sum is 25.

The square root of 51531505 is about 7178.5447689626. The cubic root of 51531505 is about 372.1267946587.

The spelling of 51531505 in words is "fifty-one million, five hundred thirty-one thousand, five hundred five".