51971522 has 4 divisors (see below), whose sum is σ = 77957286. Its totient is φ = 25985760.

The previous prime is 51971501. The next prime is 51971537. The reversal of 51971522 is 22517915.

It is a happy number.

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., 49688401 + 2283121 = 7049^2 + 1511^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12992879 + ... + 12992882.

Almost surely, 2^51971522 is an apocalyptic number.

51971522 is a deficient number, since it is larger than the sum of its proper divisors (25985764).

51971522 is a wasteful number, since it uses less digits than its factorization.

51971522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25985763.

The product of its digits is 6300, while the sum is 32.

The square root of 51971522 is about 7209.1276864819. The cubic root of 51971522 is about 373.1829657697.

The spelling of 51971522 in words is "fifty-one million, nine hundred seventy-one thousand, five hundred twenty-two".