51972178 has 4 divisors (see below), whose sum is σ = 77958270. Its totient is φ = 25986088.

The previous prime is 51972149. The next prime is 51972191. The reversal of 51972178 is 87127915.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 51940849 + 31329 = 7207^2 + 177^2 .

It is a super-2 number, since 2×51972178² = 5402214572127368, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51972178.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12993043 + ... + 12993046.

Almost surely, 2^51972178 is an apocalyptic number.

51972178 is a deficient number, since it is larger than the sum of its proper divisors (25986092).

51972178 is a wasteful number, since it uses less digits than its factorization.

51972178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25986091.

The product of its digits is 35280, while the sum is 40.

The square root of 51972178 is about 7209.1731842147. The cubic root of 51972178 is about 373.1845359052.

The spelling of 51972178 in words is "fifty-one million, nine hundred seventy-two thousand, one hundred seventy-eight".