51726521 has 16 divisors (see below), whose sum is σ = 64699008. Its totient is φ = 40176000.

The previous prime is 51726491. The next prime is 51726527. The reversal of 51726521 is 12562715.

It is a cyclic number.

It is not a de Polignac number, because 51726521 - 2²² = 47532217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51726527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27821 + ... + 29621.

It is an arithmetic number, because the mean of its divisors is an integer number (4043688).

Almost surely, 2^51726521 is an apocalyptic number.

It is an amenable number.

51726521 is a deficient number, since it is larger than the sum of its proper divisors (12972487).

51726521 is a wasteful number, since it uses less digits than its factorization.

51726521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2192.

The product of its digits is 4200, while the sum is 29.

The square root of 51726521 is about 7192.1151965190. The cubic root of 51726521 is about 372.5956296973.

The spelling of 51726521 in words is "fifty-one million, seven hundred twenty-six thousand, five hundred twenty-one".