51093621 has 12 divisors (see below), whose sum is σ = 76347180. Its totient is φ = 32887680.

The previous prime is 51093617. The next prime is 51093631. The reversal of 51093621 is 12639015.

51093621 is a `hidden beast` number, since 510 + 93 + 62 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 34398225 + 16695396 = 5865^2 + 4086^2 .

It is not a de Polignac number, because 51093621 - 2² = 51093617 is a prime.

It is a super-2 number, since 2×51093621² = 5221116213783282, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51093631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 97620 + ... + 98141.

It is an arithmetic number, because the mean of its divisors is an integer number (6362265).

Almost surely, 2^51093621 is an apocalyptic number.

It is an amenable number.

51093621 is a deficient number, since it is larger than the sum of its proper divisors (25253559).

51093621 is a wasteful number, since it uses less digits than its factorization.

51093621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195796 (or 195793 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 51093621 is about 7147.9802042255. The cubic root of 51093621 is about 371.0697577603.

The spelling of 51093621 in words is "fifty-one million, ninety-three thousand, six hundred twenty-one".