49959981 has 6 divisors (see below), whose sum is σ = 72164430. Its totient is φ = 33306648.

The previous prime is 49959977. The next prime is 49959983. The reversal of 49959981 is 18995994.

49959981 is a `hidden beast` number, since 49 + 9 + 599 + 8 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 39501225 + 10458756 = 6285^2 + 3234^2 .

It is not a de Polignac number, because 49959981 - 2² = 49959977 is a prime.

It is a super-2 number, since 2×49959981² = 4991999403040722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49959983) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2775546 + ... + 2775563.

It is an arithmetic number, because the mean of its divisors is an integer number (12027405).

Almost surely, 2^49959981 is an apocalyptic number.

It is an amenable number.

49959981 is a deficient number, since it is larger than the sum of its proper divisors (22204449).

49959981 is a wasteful number, since it uses less digits than its factorization.

49959981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5551115 (or 5551112 counting only the distinct ones).

The product of its digits is 1049760, while the sum is 54.

The square root of 49959981 is about 7068.2374747882. The cubic root of 49959981 is about 368.3048361256.

The spelling of 49959981 in words is "forty-nine million, nine hundred fifty-nine thousand, nine hundred eighty-one".