51722551 has 8 divisors (see below), whose sum is σ = 55116720. Its totient is φ = 48367488.

The previous prime is 51722543. The next prime is 51722557. The reversal of 51722551 is 15522715.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51722551 - 2³ = 51722543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51722557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7021 + ... + 12358.

It is an arithmetic number, because the mean of its divisors is an integer number (6889590).

Almost surely, 2^51722551 is an apocalyptic number.

51722551 is a deficient number, since it is larger than the sum of its proper divisors (3394169).

51722551 is a wasteful number, since it uses less digits than its factorization.

51722551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19553.

The product of its digits is 3500, while the sum is 28.

The square root of 51722551 is about 7191.8391945315. The cubic root of 51722551 is about 372.5860972404.

The spelling of 51722551 in words is "fifty-one million, seven hundred twenty-two thousand, five hundred fifty-one".