51772557 has 4 divisors (see below), whose sum is σ = 69030080. Its totient is φ = 34515036.

The previous prime is 51772543. The next prime is 51772577. The reversal of 51772557 is 75527715.

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 not a de Polignac number, because 51772557 - 2¹⁶ = 51707021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51772507) 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, 8628757 + ... + 8628762.

It is an arithmetic number, because the mean of its divisors is an integer number (17257520).

Almost surely, 2^51772557 is an apocalyptic number.

It is an amenable number.

51772557 is a deficient number, since it is larger than the sum of its proper divisors (17257523).

51772557 is a wasteful number, since it uses less digits than its factorization.

51772557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17257522.

The product of its digits is 85750, while the sum is 39.

The square root of 51772557 is about 7195.3149340387. The cubic root of 51772557 is about 372.7061321758.

The spelling of 51772557 in words is "fifty-one million, seven hundred seventy-two thousand, five hundred fifty-seven".