51216610 has 16 divisors (see below), whose sum is σ = 95369400. Its totient is φ = 19780096.

The previous prime is 51216589. The next prime is 51216611. The reversal of 51216610 is 1661215.

It can be written as a sum of positive squares in 4 ways, for example, as 30614089 + 20602521 = 5533^2 + 4539^2 .

It is a super-2 number, since 2×51216610² = 5246282279784200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51216611) 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, 88015 + ... + 88594.

Almost surely, 2^51216610 is an apocalyptic number.

51216610 is a deficient number, since it is larger than the sum of its proper divisors (44152790).

51216610 is a wasteful number, since it uses less digits than its factorization.

51216610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176645.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 51216610 is about 7156.5780929156. The cubic root of 51216610 is about 371.3672569260.

Adding to 51216610 its reverse (1661215), we get a palindrome (52877825).

The spelling of 51216610 in words is "fifty-one million, two hundred sixteen thousand, six hundred ten".