51215502 has 16 divisors (see below), whose sum is σ = 110310480. Its totient is φ = 15758592.

The previous prime is 51215501. The next prime is 51215551. The reversal of 51215502 is 20551215.

It is a super-2 number, since 2×51215502² = 5246055290224008, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51215501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 328227 + ... + 328382.

It is an arithmetic number, because the mean of its divisors is an integer number (6894405).

Almost surely, 2^51215502 is an apocalyptic number.

51215502 is an abundant number, since it is smaller than the sum of its proper divisors (59094978).

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

51215502 is a wasteful number, since it uses less digits than its factorization.

51215502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656627.

The product of its (nonzero) digits is 500, while the sum is 21.

The square root of 51215502 is about 7156.5006811989. The cubic root of 51215502 is about 371.3645789023.

Adding to 51215502 its reverse (20551215), we get a palindrome (71766717).

The spelling of 51215502 in words is "fifty-one million, two hundred fifteen thousand, five hundred two".