49877981 has 2 divisors, whose sum is σ = 49877982. Its totient is φ = 49877980.

The previous prime is 49877963. The next prime is 49878013. The reversal of 49877981 is 18977894.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49140100 + 737881 = 7010^2 + 859^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-49877981 is a prime.

It is a super-2 number, since 2×49877981² = 4975625977272722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49877911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24938990 + 24938991.

It is an arithmetic number, because the mean of its divisors is an integer number (24938991).

Almost surely, 2^49877981 is an apocalyptic number.

It is an amenable number.

49877981 is a deficient number, since it is larger than the sum of its proper divisors (1).

49877981 is an equidigital number, since it uses as much as digits as its factorization.

49877981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1016064, while the sum is 53.

The square root of 49877981 is about 7062.4344952714. The cubic root of 49877981 is about 368.1032245280.

The spelling of 49877981 in words is "forty-nine million, eight hundred seventy-seven thousand, nine hundred eighty-one".