51115260 has 96 divisors (see below), whose sum is σ = 173214720. Its totient is φ = 10994688.

The previous prime is 51115247. The next prime is 51115271. The reversal of 51115260 is 6251115.

51115260 = 1726² + 1727² + ... + 1742².

It is a super-2 number, since 2×51115260² = 5225539609735200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3561 + ... + 10719.

It is an arithmetic number, because the mean of its divisors is an integer number (1804320).

Almost surely, 2^51115260 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51115260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86607360).

51115260 is an abundant number, since it is smaller than the sum of its proper divisors (122099460).

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

51115260 is a wasteful number, since it uses less digits than its factorization.

51115260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7195 (or 7193 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 51115260 is about 7149.4936883670. The cubic root of 51115260 is about 371.1221351089.

Adding to 51115260 its reverse (6251115), we get a palindrome (57366375).

The spelling of 51115260 in words is "fifty-one million, one hundred fifteen thousand, two hundred sixty".