51125643 has 6 divisors (see below), whose sum is σ = 73848164. Its totient is φ = 34083756.

The previous prime is 51125639. The next prime is 51125671. The reversal of 51125643 is 34652115.

51125643 is a `hidden beast` number, since 5 + 1 + 12 + 5 + 643 = 666.

It is not a de Polignac number, because 51125643 - 2² = 51125639 is a prime.

It is a super-2 number, since 2×51125643² = 5227662744326898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51125743) 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, 2840305 + ... + 2840322.

Almost surely, 2^51125643 is an apocalyptic number.

51125643 is a deficient number, since it is larger than the sum of its proper divisors (22722521).

51125643 is a wasteful number, since it uses less digits than its factorization.

51125643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5680633 (or 5680630 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 51125643 is about 7150.2197868317. The cubic root of 51125643 is about 371.1472619839.

Adding to 51125643 its reverse (34652115), we get a palindrome (85777758).

The spelling of 51125643 in words is "fifty-one million, one hundred twenty-five thousand, six hundred forty-three".