49809581 has 2 divisors, whose sum is σ = 49809582. Its totient is φ = 49809580.

The previous prime is 49809569. The next prime is 49809619. The reversal of 49809581 is 18590894.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48080356 + 1729225 = 6934^2 + 1315^2 .

It is a cyclic number.

It is not a de Polignac number, because 49809581 - 2⁶ = 49809517 is a prime.

It is a super-2 number, since 2×49809581² = 4961988718791122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49809181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24904790 + 24904791.

It is an arithmetic number, because the mean of its divisors is an integer number (24904791).

Almost surely, 2^49809581 is an apocalyptic number.

It is an amenable number.

49809581 is a deficient number, since it is larger than the sum of its proper divisors (1).

49809581 is an equidigital number, since it uses as much as digits as its factorization.

49809581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 44.

The square root of 49809581 is about 7057.5903111473. The cubic root of 49809581 is about 367.9348818499.

The spelling of 49809581 in words is "forty-nine million, eight hundred nine thousand, five hundred eighty-one".