51572069 has 4 divisors (see below), whose sum is σ = 52224960. Its totient is φ = 50919180.

The previous prime is 51572051. The next prime is 51572089. The reversal of 51572069 is 96027515.

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 51572069 - 2⁸ = 51571813 is a prime.

It is a super-2 number, since 2×51572069² = 5319356601881522, 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 (51572089) 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, 326327 + ... + 326484.

It is an arithmetic number, because the mean of its divisors is an integer number (13056240).

Almost surely, 2^51572069 is an apocalyptic number.

It is an amenable number.

51572069 is a deficient number, since it is larger than the sum of its proper divisors (652891).

51572069 is an equidigital number, since it uses as much as digits as its factorization.

51572069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652890.

The product of its (nonzero) digits is 18900, while the sum is 35.

The square root of 51572069 is about 7181.3695768983. The cubic root of 51572069 is about 372.2244112674.

The spelling of 51572069 in words is "fifty-one million, five hundred seventy-two thousand, sixty-nine".