51325749 has 6 divisors (see below), whose sum is σ = 74137206. Its totient is φ = 34217160.

The previous prime is 51325741. The next prime is 51325753. The reversal of 51325749 is 94752315.

51325749 is a `hidden beast` number, since 51 + 32 + 574 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 46991025 + 4334724 = 6855^2 + 2082^2 .

It is not a de Polignac number, because 51325749 - 2³ = 51325741 is a prime.

It is a super-2 number, since 2×51325749² = 5268665020822002, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51325741) 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, 2851422 + ... + 2851439.

It is an arithmetic number, because the mean of its divisors is an integer number (12356201).

Almost surely, 2^51325749 is an apocalyptic number.

It is an amenable number.

51325749 is a deficient number, since it is larger than the sum of its proper divisors (22811457).

51325749 is a wasteful number, since it uses less digits than its factorization.

51325749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5702867 (or 5702864 counting only the distinct ones).

The product of its digits is 37800, while the sum is 36.

The square root of 51325749 is about 7164.1991178359. The cubic root of 51325749 is about 371.6308556281.

It can be divided in two parts, 513 and 25749, that added together give a palindrome (26262).

The spelling of 51325749 in words is "fifty-one million, three hundred twenty-five thousand, seven hundred forty-nine".