390624169981 has 2 divisors, whose sum is σ = 390624169982. Its totient is φ = 390624169980.

The previous prime is 390624169973. The next prime is 390624170011. The reversal of 390624169981 is 189961426093.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 285486107481 + 105138062500 = 534309^2 + 324250^2 .

It is a cyclic number.

It is not a de Polignac number, because 390624169981 - 2³ = 390624169973 is a prime.

It is a super-2 number, since 2×390624169981² (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 (390624169781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195312084990 + 195312084991.

It is an arithmetic number, because the mean of its divisors is an integer number (195312084991).

Almost surely, 2^390624169981 is an apocalyptic number.

It is an amenable number.

390624169981 is a deficient number, since it is larger than the sum of its proper divisors (1).

390624169981 is an equidigital number, since it uses as much as digits as its factorization.

390624169981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5038848, while the sum is 58.

The spelling of 390624169981 in words is "three hundred ninety billion, six hundred twenty-four million, one hundred sixty-nine thousand, nine hundred eighty-one".