49903561 has 2 divisors, whose sum is σ = 49903562. Its totient is φ = 49903560.

The previous prime is 49903547. The next prime is 49903621. The reversal of 49903561 is 16530994.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33419961 + 16483600 = 5781^2 + 4060^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-49903561 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 49903561.

It is not a weakly prime, because it can be changed into another prime (49903531) 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, 24951780 + 24951781.

It is an arithmetic number, because the mean of its divisors is an integer number (24951781).

Almost surely, 2^49903561 is an apocalyptic number.

It is an amenable number.

49903561 is a deficient number, since it is larger than the sum of its proper divisors (1).

49903561 is an equidigital number, since it uses as much as digits as its factorization.

49903561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 49903561 is about 7064.2452533869. The cubic root of 49903561 is about 368.1661412103.

The spelling of 49903561 in words is "forty-nine million, nine hundred three thousand, five hundred sixty-one".