842509251 has 12 divisors (see below), whose sum is σ = 1269869328. Its totient is φ = 537252144.

The previous prime is 842509243. The next prime is 842509259. The reversal of 842509251 is 152905248.

It is an interprime number because it is at equal distance from previous prime (842509243) and next prime (842509259).

It is not a de Polignac number, because 842509251 - 2³ = 842509243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (842509259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2034840 + ... + 2035253.

It is an arithmetic number, because the mean of its divisors is an integer number (105822444).

Almost surely, 2^842509251 is an apocalyptic number.

842509251 is a deficient number, since it is larger than the sum of its proper divisors (427360077).

842509251 is a wasteful number, since it uses less digits than its factorization.

842509251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4070122 (or 4070119 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 842509251 is about 29026.0099049111. The cubic root of 842509251 is about 944.4773762599.

The spelling of 842509251 in words is "eight hundred forty-two million, five hundred nine thousand, two hundred fifty-one".