51115972 has 6 divisors (see below), whose sum is σ = 89452958. Its totient is φ = 25557984.

The previous prime is 51115943. The next prime is 51115973. The reversal of 51115972 is 27951115.

It can be written as a sum of positive squares in only one way, i.e., 36554116 + 14561856 = 6046^2 + 3816^2 .

It is a super-2 number, since 2×51115972² = 5225685187009568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51115973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6389493 + ... + 6389500.

Almost surely, 2^51115972 is an apocalyptic number.

It is an amenable number.

51115972 is a deficient number, since it is larger than the sum of its proper divisors (38336986).

51115972 is a wasteful number, since it uses less digits than its factorization.

51115972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12778997 (or 12778995 counting only the distinct ones).

The product of its digits is 3150, while the sum is 31.

The square root of 51115972 is about 7149.5434819295. The cubic root of 51115972 is about 371.1238582586.

The spelling of 51115972 in words is "fifty-one million, one hundred fifteen thousand, nine hundred seventy-two".