51402577 has 4 divisors (see below), whose sum is σ = 54426276. Its totient is φ = 48378880.

The previous prime is 51402563. The next prime is 51402607. The reversal of 51402577 is 77520415.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 46566976 + 4835601 = 6824^2 + 2199^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51402577 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51402977) 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 3 ways as a sum of consecutive naturals, for example, 1511824 + ... + 1511857.

It is an arithmetic number, because the mean of its divisors is an integer number (13606569).

Almost surely, 2^51402577 is an apocalyptic number.

It is an amenable number.

51402577 is a deficient number, since it is larger than the sum of its proper divisors (3023699).

51402577 is a wasteful number, since it uses less digits than its factorization.

51402577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3023698.

The product of its (nonzero) digits is 9800, while the sum is 31.

The square root of 51402577 is about 7169.5590519920. The cubic root of 51402577 is about 371.8161909404.

The spelling of 51402577 in words is "fifty-one million, four hundred two thousand, five hundred seventy-seven".