49999561 has 2 divisors, whose sum is σ = 49999562. Its totient is φ = 49999560.

The previous prime is 49999553. The next prime is 49999589. The reversal of 49999561 is 16599994.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48720400 + 1279161 = 6980^2 + 1131^2 .

It is a cyclic number.

It is not a de Polignac number, because 49999561 - 2³ = 49999553 is a prime.

It is a super-2 number, since 2×49999561² = 4999912200385442, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 49999499 and 49999508.

It is not a weakly prime, because it can be changed into another prime (49999361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24999780 + 24999781.

It is an arithmetic number, because the mean of its divisors is an integer number (24999781).

Almost surely, 2^49999561 is an apocalyptic number.

It is an amenable number.

49999561 is a deficient number, since it is larger than the sum of its proper divisors (1).

49999561 is an equidigital number, since it uses as much as digits as its factorization.

49999561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 787320, while the sum is 52.

The square root of 49999561 is about 7071.0367698096. The cubic root of 49999561 is about 368.4020716677.

The spelling of 49999561 in words is "forty-nine million, nine hundred ninety-nine thousand, five hundred sixty-one".