842172631 has 2 divisors, whose sum is σ = 842172632. Its totient is φ = 842172630.

The previous prime is 842172619. The next prime is 842172637. The reversal of 842172631 is 136271248.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 842172631 - 2⁹ = 842172119 is a prime.

It is a super-2 number, since 2×842172631² = 1418509480810924322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (842172637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421086315 + 421086316.

It is an arithmetic number, because the mean of its divisors is an integer number (421086316).

Almost surely, 2^842172631 is an apocalyptic number.

842172631 is a deficient number, since it is larger than the sum of its proper divisors (1).

842172631 is an equidigital number, since it uses as much as digits as its factorization.

842172631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 34.

The square root of 842172631 is about 29020.2107332114. The cubic root of 842172631 is about 944.3515725666.

The spelling of 842172631 in words is "eight hundred forty-two million, one hundred seventy-two thousand, six hundred thirty-one".