51261172 has 6 divisors (see below), whose sum is σ = 89707058. Its totient is φ = 25630584.

The previous prime is 51261157. The next prime is 51261179. The reversal of 51261172 is 27116215.

It can be written as a sum of positive squares in only one way, i.e., 50751376 + 509796 = 7124^2 + 714^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51261179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6407643 + ... + 6407650.

Almost surely, 2^51261172 is an apocalyptic number.

It is an amenable number.

51261172 is a deficient number, since it is larger than the sum of its proper divisors (38445886).

51261172 is a wasteful number, since it uses less digits than its factorization.

51261172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12815297 (or 12815295 counting only the distinct ones).

The product of its digits is 840, while the sum is 25.

The square root of 51261172 is about 7159.6907754455. The cubic root of 51261172 is about 371.4749307872.

Adding to 51261172 its reverse (27116215), we get a palindrome (78377387).

The spelling of 51261172 in words is "fifty-one million, two hundred sixty-one thousand, one hundred seventy-two".