49031981 has 2 divisors, whose sum is σ = 49031982. Its totient is φ = 49031980.

The previous prime is 49031963. The next prime is 49032019. The reversal of 49031981 is 18913094.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36844900 + 12187081 = 6070^2 + 3491^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-49031981 is a prime.

It is a super-2 number, since 2×49031981² = 4808270321568722, 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 (49031581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24515990 + 24515991.

It is an arithmetic number, because the mean of its divisors is an integer number (24515991).

Almost surely, 2^49031981 is an apocalyptic number.

It is an amenable number.

49031981 is a deficient number, since it is larger than the sum of its proper divisors (1).

49031981 is an equidigital number, since it uses as much as digits as its factorization.

49031981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 49031981 is about 7002.2839845296. The cubic root of 49031981 is about 366.0101647470.

The spelling of 49031981 in words is "forty-nine million, thirty-one thousand, nine hundred eighty-one".