51075581 has 2 divisors, whose sum is σ = 51075582. Its totient is φ = 51075580.

The previous prime is 51075559. The next prime is 51075589. The reversal of 51075581 is 18557015.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36711481 + 14364100 = 6059^2 + 3790^2 .

It is a cyclic number.

It is not a de Polignac number, because 51075581 - 2²² = 46881277 is a prime.

It is a super-2 number, since 2×51075581² = 5217429948975122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51075589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25537790 + 25537791.

It is an arithmetic number, because the mean of its divisors is an integer number (25537791).

Almost surely, 2^51075581 is an apocalyptic number.

It is an amenable number.

51075581 is a deficient number, since it is larger than the sum of its proper divisors (1).

51075581 is an equidigital number, since it uses as much as digits as its factorization.

51075581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7000, while the sum is 32.

The square root of 51075581 is about 7146.7181978864. The cubic root of 51075581 is about 371.0260805112.

The spelling of 51075581 in words is "fifty-one million, seventy-five thousand, five hundred eighty-one".