390585250981 has 2 divisors, whose sum is σ = 390585250982. Its totient is φ = 390585250980.

The previous prime is 390585250969. The next prime is 390585251011. The reversal of 390585250981 is 189052585093.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 272623913956 + 117961337025 = 522134^2 + 343455^2 .

It is an emirp because it is prime and its reverse (189052585093) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 390585250981 - 2³³ = 381995316389 is a prime.

It is a super-2 number, since 2×390585250981² (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 (390585250901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195292625490 + 195292625491.

It is an arithmetic number, because the mean of its divisors is an integer number (195292625491).

Almost surely, 2^390585250981 is an apocalyptic number.

It is an amenable number.

390585250981 is a deficient number, since it is larger than the sum of its proper divisors (1).

390585250981 is an equidigital number, since it uses as much as digits as its factorization.

390585250981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888000, while the sum is 55.

The spelling of 390585250981 in words is "three hundred ninety billion, five hundred eighty-five million, two hundred fifty thousand, nine hundred eighty-one".