49105981 has 2 divisors, whose sum is σ = 49105982. Its totient is φ = 49105980.

The previous prime is 49105963. The next prime is 49106009. The reversal of 49105981 is 18950194.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39803481 + 9302500 = 6309^2 + 3050^2 .

It is a cyclic number.

It is not a de Polignac number, because 49105981 - 2⁷ = 49105853 is a prime.

It is a super-2 number, since 2×49105981² = 4822794739944722, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 49105981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49105951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24552990 + 24552991.

It is an arithmetic number, because the mean of its divisors is an integer number (24552991).

Almost surely, 2^49105981 is an apocalyptic number.

It is an amenable number.

49105981 is a deficient number, since it is larger than the sum of its proper divisors (1).

49105981 is an equidigital number, since it uses as much as digits as its factorization.

49105981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 49105981 is about 7007.5659825648. The cubic root of 49105981 is about 366.1942020321.

It can be divided in two parts, 49105 and 981, that added together give a triangular number (50086 = T₃₁₆).

The spelling of 49105981 in words is "forty-nine million, one hundred five thousand, nine hundred eighty-one".