51503172 has 48 divisors (see below), whose sum is σ = 137733120. Its totient is φ = 14673312.

The previous prime is 51503161. The next prime is 51503173. The reversal of 51503172 is 27130515.

It is a super-3 number, since 3×51503172³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (51503173) 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, 40279 + ... + 41537.

It is an arithmetic number, because the mean of its divisors is an integer number (2869440).

Almost surely, 2^51503172 is an apocalyptic number.

It is an amenable number.

51503172 is an abundant number, since it is smaller than the sum of its proper divisors (86229948).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51503172 is a wasteful number, since it uses less digits than its factorization.

51503172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1760 (or 1758 counting only the distinct ones).

The product of its (nonzero) digits is 1050, while the sum is 24.

The square root of 51503172 is about 7176.5710475129. The cubic root of 51503172 is about 372.0585813628.

Adding to 51503172 its reverse (27130515), we get a palindrome (78633687).

The spelling of 51503172 in words is "fifty-one million, five hundred three thousand, one hundred seventy-two".