51745739 has 6 divisors (see below), whose sum is σ = 54968964. Its totient is φ = 48701600.

The previous prime is 51745693. The next prime is 51745741. The reversal of 51745739 is 93754715.

It is a de Polignac number, because none of the positive numbers 2^k-51745739 is a prime.

It is a super-2 number, since 2×51745739² = 5355243009312242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51745696 and 51745705.

It is not an unprimeable number, because it can be changed into a prime (51745139) 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, 89237 + ... + 89814.

It is an arithmetic number, because the mean of its divisors is an integer number (9161494).

Almost surely, 2^51745739 is an apocalyptic number.

51745739 is a deficient number, since it is larger than the sum of its proper divisors (3223225).

51745739 is a wasteful number, since it uses less digits than its factorization.

51745739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179085 (or 179068 counting only the distinct ones).

The product of its digits is 132300, while the sum is 41.

The square root of 51745739 is about 7193.4511188997. The cubic root of 51745739 is about 372.6417675782.

The spelling of 51745739 in words is "fifty-one million, seven hundred forty-five thousand, seven hundred thirty-nine".