51977745 has 12 divisors (see below), whose sum is σ = 90094836. Its totient is φ = 27721440.

The previous prime is 51977713. The next prime is 51977747. The reversal of 51977745 is 54777915.

It can be written as a sum of positive squares in 2 ways, for example, as 11068929 + 40908816 = 3327^2 + 6396^2 .

It is not a de Polignac number, because 51977745 - 2⁵ = 51977713 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 1155061 = 51977745 / (5 + 1 + 9 + 7 + 7 + 7 + 4 + 5).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51977745.

It is not an unprimeable number, because it can be changed into a prime (51977747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 577486 + ... + 577575.

It is an arithmetic number, because the mean of its divisors is an integer number (7507903).

Almost surely, 2^51977745 is an apocalyptic number.

It is an amenable number.

51977745 is a deficient number, since it is larger than the sum of its proper divisors (38117091).

51977745 is a wasteful number, since it uses less digits than its factorization.

51977745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1155072 (or 1155069 counting only the distinct ones).

The product of its digits is 308700, while the sum is 45.

The square root of 51977745 is about 7209.5592791793. The cubic root of 51977745 is about 373.1978599837.

The spelling of 51977745 in words is "fifty-one million, nine hundred seventy-seven thousand, seven hundred forty-five".