50811581 has 2 divisors, whose sum is σ = 50811582. Its totient is φ = 50811580.

The previous prime is 50811571. The next prime is 50811599. The reversal of 50811581 is 18511805.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50623225 + 188356 = 7115^2 + 434^2 .

It is a cyclic number.

It is not a de Polignac number, because 50811581 - 2¹⁴ = 50795197 is a prime.

It is a super-2 number, since 2×50811581² = 5163633527439122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50811571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25405790 + 25405791.

It is an arithmetic number, because the mean of its divisors is an integer number (25405791).

Almost surely, 2^50811581 is an apocalyptic number.

It is an amenable number.

50811581 is a deficient number, since it is larger than the sum of its proper divisors (1).

50811581 is an equidigital number, since it uses as much as digits as its factorization.

50811581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1600, while the sum is 29.

The square root of 50811581 is about 7128.2242529258. The cubic root of 50811581 is about 370.3857214406.

The spelling of 50811581 in words is "fifty million, eight hundred eleven thousand, five hundred eighty-one".