51107645 has 8 divisors (see below), whose sum is σ = 61375320. Its totient is φ = 40855360.

The previous prime is 51107603. The next prime is 51107653. The reversal of 51107645 is 54670115.

It can be written as a sum of positive squares in 4 ways, for example, as 1249924 + 49857721 = 1118^2 + 7061^2 .

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

It is not a de Polignac number, because 51107645 - 2²⁰ = 50059069 is a prime.

It is a super-2 number, since 2×51107645² = 5223982754892050, which contains 22 as substring.

It is a Curzon number.

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, 5555 + ... + 11535.

It is an arithmetic number, because the mean of its divisors is an integer number (7671915).

Almost surely, 2^51107645 is an apocalyptic number.

It is an amenable number.

51107645 is a deficient number, since it is larger than the sum of its proper divisors (10267675).

51107645 is a wasteful number, since it uses less digits than its factorization.

51107645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7695.

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 51107645 is about 7148.9611133367. The cubic root of 51107645 is about 371.1037046349.

The spelling of 51107645 in words is "fifty-one million, one hundred seven thousand, six hundred forty-five".