51634645 has 8 divisors (see below), whose sum is σ = 64098360. Its totient is φ = 39883200.

The previous prime is 51634643. The next prime is 51634657. The reversal of 51634645 is 54643615.

It can be written as a sum of positive squares in 4 ways, for example, as 125316 + 51509329 = 354^2 + 7177^2 .

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

It is not a de Polignac number, because 51634645 - 2¹ = 51634643 is a prime.

It is a super-2 number, since 2×51634645² = 5332273128552050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51634645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51634643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177906 + ... + 178195.

It is an arithmetic number, because the mean of its divisors is an integer number (8012295).

Almost surely, 2^51634645 is an apocalyptic number.

It is an amenable number.

51634645 is a deficient number, since it is larger than the sum of its proper divisors (12463715).

51634645 is a wasteful number, since it uses less digits than its factorization.

51634645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356135.

The product of its digits is 43200, while the sum is 34.

The square root of 51634645 is about 7185.7250851950. The cubic root of 51634645 is about 372.3748990593.

The spelling of 51634645 in words is "fifty-one million, six hundred thirty-four thousand, six hundred forty-five".