51008645 has 8 divisors (see below), whose sum is σ = 61349400. Its totient is φ = 40714240.

The previous prime is 51008623. The next prime is 51008669. The reversal of 51008645 is 54680015.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5189284 + 45819361 = 2278^2 + 6769^2 .

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

It is not a de Polignac number, because 51008645 - 2¹² = 51004549 is a prime.

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, 9116 + ... + 13605.

It is an arithmetic number, because the mean of its divisors is an integer number (7668675).

Almost surely, 2^51008645 is an apocalyptic number.

It is an amenable number.

51008645 is a deficient number, since it is larger than the sum of its proper divisors (10340755).

51008645 is a wasteful number, since it uses less digits than its factorization.

51008645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23175.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 51008645 is about 7142.0336739615. The cubic root of 51008645 is about 370.8639295829.

The spelling of 51008645 in words is "fifty-one million, eight thousand, six hundred forty-five".