51261651 has 12 divisors (see below), whose sum is σ = 84622512. Its totient is φ = 29292336.

The previous prime is 51261649. The next prime is 51261673. The reversal of 51261651 is 15616215.

It is a happy number.

51261651 is a `hidden beast` number, since 5 + 1 + 2 + 6 + 1 + 651 = 666.

It is not a de Polignac number, because 51261651 - 2¹ = 51261649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51261611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 406776 + ... + 406901.

It is an arithmetic number, because the mean of its divisors is an integer number (7051876).

Almost surely, 2^51261651 is an apocalyptic number.

51261651 is a deficient number, since it is larger than the sum of its proper divisors (33360861).

51261651 is a wasteful number, since it uses less digits than its factorization.

51261651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 813690 (or 813687 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 51261651 is about 7159.7242265328. The cubic root of 51261651 is about 371.4760878418.

Adding to 51261651 its reverse (15616215), we get a palindrome (66877866).

The spelling of 51261651 in words is "fifty-one million, two hundred sixty-one thousand, six hundred fifty-one".