51336645 has 16 divisors (see below), whose sum is σ = 82665600. Its totient is φ = 27203904.

The previous prime is 51336631. The next prime is 51336647. The reversal of 51336645 is 54663315.

It is not a de Polignac number, because 51336645 - 2⁴ = 51336629 is a prime.

It is a super-2 number, since 2×51336645² = 5270902239712050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51336647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8545 + ... + 13254.

It is an arithmetic number, because the mean of its divisors is an integer number (5166600).

Almost surely, 2^51336645 is an apocalyptic number.

It is an amenable number.

51336645 is a deficient number, since it is larger than the sum of its proper divisors (31328955).

51336645 is a wasteful number, since it uses less digits than its factorization.

51336645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21964.

The product of its digits is 32400, while the sum is 33.

The square root of 51336645 is about 7164.9595253567. The cubic root of 51336645 is about 371.6571517424.

The spelling of 51336645 in words is "fifty-one million, three hundred thirty-six thousand, six hundred forty-five".