49621981 has 2 divisors, whose sum is σ = 49621982. Its totient is φ = 49621980.

The previous prime is 49621961. The next prime is 49622003. The reversal of 49621981 is 18912694.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36905625 + 12716356 = 6075^2 + 3566^2 .

It is a cyclic number.

It is not a de Polignac number, because 49621981 - 2¹⁹ = 49097693 is a prime.

It is a super-2 number, since 2×49621981² = 4924681996728722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49621961) 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, 24810990 + 24810991.

It is an arithmetic number, because the mean of its divisors is an integer number (24810991).

Almost surely, 2^49621981 is an apocalyptic number.

It is an amenable number.

49621981 is a deficient number, since it is larger than the sum of its proper divisors (1).

49621981 is an equidigital number, since it uses as much as digits as its factorization.

49621981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 40.

The square root of 49621981 is about 7044.2871179417. The cubic root of 49621981 is about 367.4723776422.

The spelling of 49621981 in words is "forty-nine million, six hundred twenty-one thousand, nine hundred eighty-one".