51972229 has 4 divisors (see below), whose sum is σ = 52010176. Its totient is φ = 51934284.

The previous prime is 51972227. The next prime is 51972259. The reversal of 51972229 is 92227915.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51972229 - 2¹ = 51972227 is a prime.

It is a super-2 number, since 2×51972229² = 5402225174456882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51972227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16839 + ... + 19684.

It is an arithmetic number, because the mean of its divisors is an integer number (13002544).

Almost surely, 2^51972229 is an apocalyptic number.

It is an amenable number.

51972229 is a deficient number, since it is larger than the sum of its proper divisors (37947).

51972229 is a wasteful number, since it uses less digits than its factorization.

51972229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37946.

The product of its digits is 22680, while the sum is 37.

The square root of 51972229 is about 7209.1767213739. The cubic root of 51972229 is about 373.1846579731.

The spelling of 51972229 in words is "fifty-one million, nine hundred seventy-two thousand, two hundred twenty-nine".