842921631 has 6 divisors (see below), whose sum is σ = 1217553480. Its totient is φ = 561947748.

The previous prime is 842921623. The next prime is 842921633. The reversal of 842921631 is 136129248.

It is not a de Polignac number, because 842921631 - 2³ = 842921623 is a prime.

It is a super-2 number, since 2×842921631² = 1421033752015400322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (842921633) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 46828971 + ... + 46828988.

It is an arithmetic number, because the mean of its divisors is an integer number (202925580).

Almost surely, 2^842921631 is an apocalyptic number.

842921631 is a deficient number, since it is larger than the sum of its proper divisors (374631849).

842921631 is a wasteful number, since it uses less digits than its factorization.

842921631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93657965 (or 93657962 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 842921631 is about 29033.1126646800. The cubic root of 842921631 is about 944.6314477833.

The spelling of 842921631 in words is "eight hundred forty-two million, nine hundred twenty-one thousand, six hundred thirty-one".