51621327 has 16 divisors (see below), whose sum is σ = 78544480. Its totient is φ = 33483456.

The previous prime is 51621319. The next prime is 51621329. The reversal of 51621327 is 72312615.

It is a happy number.

51621327 is a `hidden beast` number, since 5 + 1 + 621 + 32 + 7 = 666.

It is not a de Polignac number, because 51621327 - 2³ = 51621319 is a prime.

It is a super-2 number, since 2×51621327² = 5329522802481858, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51621327.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51621329) 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, 24838 + ... + 26835.

It is an arithmetic number, because the mean of its divisors is an integer number (4909030).

Almost surely, 2^51621327 is an apocalyptic number.

51621327 is a deficient number, since it is larger than the sum of its proper divisors (26923153).

51621327 is a wasteful number, since it uses less digits than its factorization.

51621327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51719 (or 51713 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 51621327 is about 7184.7983270235. The cubic root of 51621327 is about 372.3428810519.

The spelling of 51621327 in words is "fifty-one million, six hundred twenty-one thousand, three hundred twenty-seven".