398990076581 has 2 divisors, whose sum is σ = 398990076582. Its totient is φ = 398990076580.

The previous prime is 398990076577. The next prime is 398990076607. The reversal of 398990076581 is 185670099893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 272702239681 + 126287836900 = 522209^2 + 355370^2 .

It is a cyclic number.

It is not a de Polignac number, because 398990076581 - 2² = 398990076577 is a prime.

It is a super-2 number, since 2×398990076581² (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 (398990076481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199495038290 + 199495038291.

It is an arithmetic number, because the mean of its divisors is an integer number (199495038291).

Almost surely, 2^398990076581 is an apocalyptic number.

It is an amenable number.

398990076581 is a deficient number, since it is larger than the sum of its proper divisors (1).

398990076581 is an equidigital number, since it uses as much as digits as its factorization.

398990076581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29393280, while the sum is 65.

The spelling of 398990076581 in words is "three hundred ninety-eight billion, nine hundred ninety million, seventy-six thousand, five hundred eighty-one".