394229422581 has 4 divisors (see below), whose sum is σ = 525639230112. Its totient is φ = 262819615052.

The previous prime is 394229422541. The next prime is 394229422591. The reversal of 394229422581 is 185224922493.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 394229422581 - 2⁷ = 394229422453 is a prime.

It is a super-2 number, since 2×394229422581² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394229422511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65704903761 + ... + 65704903766.

It is an arithmetic number, because the mean of its divisors is an integer number (131409807528).

Almost surely, 2^394229422581 is an apocalyptic number.

It is an amenable number.

394229422581 is a deficient number, since it is larger than the sum of its proper divisors (131409807531).

394229422581 is a wasteful number, since it uses less digits than its factorization.

394229422581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131409807530.

The product of its digits is 2488320, while the sum is 51.

The spelling of 394229422581 in words is "three hundred ninety-four billion, two hundred twenty-nine million, four hundred twenty-two thousand, five hundred eighty-one".