51530643 has 6 divisors (see below), whose sum is σ = 74433164. Its totient is φ = 34353756.

The previous prime is 51530629. The next prime is 51530653. The reversal of 51530643 is 34603515.

51530643 is a `hidden beast` number, since 5 + 15 + 3 + 0 + 643 = 666.

It is not a de Polignac number, because 51530643 - 2⁶ = 51530579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51530653) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2862805 + ... + 2862822.

Almost surely, 2^51530643 is an apocalyptic number.

51530643 is a deficient number, since it is larger than the sum of its proper divisors (22902521).

51530643 is a wasteful number, since it uses less digits than its factorization.

51530643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5725633 (or 5725630 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

The square root of 51530643 is about 7178.4847286875. The cubic root of 51530643 is about 372.1247197139.

The spelling of 51530643 in words is "fifty-one million, five hundred thirty thousand, six hundred forty-three".