51801644 has 6 divisors (see below), whose sum is σ = 90652884. Its totient is φ = 25900820.

The previous prime is 51801641. The next prime is 51801647. The reversal of 51801644 is 44610815.

51801644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (51801641) and next prime (51801647).

It is a super-2 number, since 2×51801644² = 5366820642205472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51801641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6475202 + ... + 6475209.

It is an arithmetic number, because the mean of its divisors is an integer number (15108814).

Almost surely, 2^51801644 is an apocalyptic number.

It is an amenable number.

51801644 is a deficient number, since it is larger than the sum of its proper divisors (38851240).

51801644 is a wasteful number, since it uses less digits than its factorization.

51801644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12950415 (or 12950413 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 51801644 is about 7197.3358960104. The cubic root of 51801644 is about 372.7759173690.

The spelling of 51801644 in words is "fifty-one million, eight hundred one thousand, six hundred forty-four".