50921581 has 2 divisors, whose sum is σ = 50921582. Its totient is φ = 50921580.

The previous prime is 50921573. The next prime is 50921597. The reversal of 50921581 is 18512905.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50836900 + 84681 = 7130^2 + 291^2 .

It is a cyclic number.

It is not a de Polignac number, because 50921581 - 2³ = 50921573 is a prime.

It is a super-2 number, since 2×50921581² = 5186014823079122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50921531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25460790 + 25460791.

It is an arithmetic number, because the mean of its divisors is an integer number (25460791).

Almost surely, 2^50921581 is an apocalyptic number.

It is an amenable number.

50921581 is a deficient number, since it is larger than the sum of its proper divisors (1).

50921581 is an equidigital number, since it uses as much as digits as its factorization.

50921581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 31.

The square root of 50921581 is about 7135.9358881649. The cubic root of 50921581 is about 370.6528066425.

The spelling of 50921581 in words is "fifty million, nine hundred twenty-one thousand, five hundred eighty-one".