842489481 has 4 divisors (see below), whose sum is σ = 1123319312. Its totient is φ = 561659652.

The previous prime is 842489477. The next prime is 842489489. The reversal of 842489481 is 184984248.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 842489481 - 2² = 842489477 is a prime.

It is a super-2 number, since 2×842489481² = 1419577051191298722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 842489481.

It is not an unprimeable number, because it can be changed into a prime (842489489) 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, 140414911 + ... + 140414916.

It is an arithmetic number, because the mean of its divisors is an integer number (280829828).

Almost surely, 2^842489481 is an apocalyptic number.

It is an amenable number.

842489481 is a deficient number, since it is larger than the sum of its proper divisors (280829831).

842489481 is a wasteful number, since it uses less digits than its factorization.

842489481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280829830.

The product of its digits is 589824, while the sum is 48.

The square root of 842489481 is about 29025.6693462873. The cubic root of 842489481 is about 944.4699886204.

The spelling of 842489481 in words is "eight hundred forty-two million, four hundred eighty-nine thousand, four hundred eighty-one".