51749645 has 8 divisors (see below), whose sum is σ = 62142360. Its totient is φ = 41371200.

The previous prime is 51749623. The next prime is 51749651. The reversal of 51749645 is 54694715.

It can be written as a sum of positive squares in 4 ways, for example, as 4153444 + 47596201 = 2038^2 + 6899^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51749645 - 2⁸ = 51749389 is a prime.

It is a super-3 number, since 3×51749645³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7595 + ... + 12695.

It is an arithmetic number, because the mean of its divisors is an integer number (7767795).

Almost surely, 2^51749645 is an apocalyptic number.

It is an amenable number.

51749645 is a deficient number, since it is larger than the sum of its proper divisors (10392715).

51749645 is a wasteful number, since it uses less digits than its factorization.

51749645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7135.

The product of its digits is 151200, while the sum is 41.

The square root of 51749645 is about 7193.7226107211. The cubic root of 51749645 is about 372.6511435652.

The spelling of 51749645 in words is "fifty-one million, seven hundred forty-nine thousand, six hundred forty-five".