390775049981 has 2 divisors, whose sum is σ = 390775049982. Its totient is φ = 390775049980.

The previous prime is 390775049947. The next prime is 390775050007. The reversal of 390775049981 is 189940577093.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 350394147481 + 40380902500 = 591941^2 + 200950^2 .

It is an emirp because it is prime and its reverse (189940577093) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-390775049981 is a prime.

It is a super-2 number, since 2×390775049981² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (390775049941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195387524990 + 195387524991.

It is an arithmetic number, because the mean of its divisors is an integer number (195387524991).

Almost surely, 2^390775049981 is an apocalyptic number.

It is an amenable number.

390775049981 is a deficient number, since it is larger than the sum of its proper divisors (1).

390775049981 is an equidigital number, since it uses as much as digits as its factorization.

390775049981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17146080, while the sum is 62.

The spelling of 390775049981 in words is "three hundred ninety billion, seven hundred seventy-five million, forty-nine thousand, nine hundred eighty-one".