50409581 has 2 divisors, whose sum is σ = 50409582. Its totient is φ = 50409580.

The previous prime is 50409563. The next prime is 50409617. The reversal of 50409581 is 18590405.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40386025 + 10023556 = 6355^2 + 3166^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-50409581 is a prime.

It is a super-2 number, since 2×50409581² = 5082251713191122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50409551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25204790 + 25204791.

It is an arithmetic number, because the mean of its divisors is an integer number (25204791).

Almost surely, 2^50409581 is an apocalyptic number.

It is an amenable number.

50409581 is a deficient number, since it is larger than the sum of its proper divisors (1).

50409581 is an equidigital number, since it uses as much as digits as its factorization.

50409581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 50409581 is about 7099.9704928964. The cubic root of 50409581 is about 369.4063550751.

Adding to 50409581 its reverse (18590405), we get a palindrome (68999986).

The spelling of 50409581 in words is "fifty million, four hundred nine thousand, five hundred eighty-one".