394605860631 has 4 divisors (see below), whose sum is σ = 526141147512. Its totient is φ = 263070573752.

The previous prime is 394605860629. The next prime is 394605860689. The reversal of 394605860631 is 136068506493.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 136068506493 = 3 ⋅45356168831.

It is a cyclic number.

It is not a de Polignac number, because 394605860631 - 2¹ = 394605860629 is a prime.

It is a super-2 number, since 2×394605860631² (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 (394605860611) 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, 65767643436 + ... + 65767643441.

It is an arithmetic number, because the mean of its divisors is an integer number (131535286878).

Almost surely, 2^394605860631 is an apocalyptic number.

394605860631 is a deficient number, since it is larger than the sum of its proper divisors (131535286881).

394605860631 is a wasteful number, since it uses less digits than its factorization.

394605860631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131535286880.

The product of its (nonzero) digits is 2799360, while the sum is 51.

The spelling of 394605860631 in words is "three hundred ninety-four billion, six hundred five million, eight hundred sixty thousand, six hundred thirty-one".