51972455 has 4 divisors (see below), whose sum is σ = 62366952. Its totient is φ = 41577960.

The previous prime is 51972443. The next prime is 51972469. The reversal of 51972455 is 55427915.

It is a happy number.

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

It is not a de Polignac number, because 51972455 - 2⁴ = 51972439 is a prime.

It is a super-2 number, since 2×51972455² = 5402272157454050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5197241 + ... + 5197250.

It is an arithmetic number, because the mean of its divisors is an integer number (15591738).

Almost surely, 2^51972455 is an apocalyptic number.

51972455 is a deficient number, since it is larger than the sum of its proper divisors (10394497).

51972455 is a wasteful number, since it uses less digits than its factorization.

51972455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10394496.

The product of its digits is 63000, while the sum is 38.

The square root of 51972455 is about 7209.1923958235. The cubic root of 51972455 is about 373.1851989005.

The spelling of 51972455 in words is "fifty-one million, nine hundred seventy-two thousand, four hundred fifty-five".