51036645 has 16 divisors (see below), whose sum is σ = 89082432. Its totient is φ = 24744960.

The previous prime is 51036631. The next prime is 51036691. The reversal of 51036645 is 54663015.

It is not a de Polignac number, because 51036645 - 2⁶ = 51036581 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154492 + ... + 154821.

It is an arithmetic number, because the mean of its divisors is an integer number (5567652).

Almost surely, 2^51036645 is an apocalyptic number.

51036645 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51036645 is a deficient number, since it is larger than the sum of its proper divisors (38045787).

51036645 is a wasteful number, since it uses less digits than its factorization.

51036645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309332.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 51036645 is about 7143.9936310162. The cubic root of 51036645 is about 370.9317761904.

It can be divided in two parts, 51036 and 645, that added together give a triangular number (51681 = T₃₂₁).

The spelling of 51036645 in words is "fifty-one million, thirty-six thousand, six hundred forty-five".