842509631 has 4 divisors (see below), whose sum is σ = 842870952. Its totient is φ = 842148312.

The previous prime is 842509583. The next prime is 842509637. The reversal of 842509631 is 136905248.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-842509631 is a prime.

It is a super-2 number, since 2×842509631² = 1419644956655512322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (842509637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 177140 + ... + 181833.

It is an arithmetic number, because the mean of its divisors is an integer number (210717738).

Almost surely, 2^842509631 is an apocalyptic number.

842509631 is a deficient number, since it is larger than the sum of its proper divisors (361321).

842509631 is a wasteful number, since it uses less digits than its factorization.

842509631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361320.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 842509631 is about 29026.0164507636. The cubic root of 842509631 is about 944.4775182569.

The spelling of 842509631 in words is "eight hundred forty-two million, five hundred nine thousand, six hundred thirty-one".