84881831 has 4 divisors (see below), whose sum is σ = 86148792. Its totient is φ = 83614872.

The previous prime is 84881803. The next prime is 84881851. The reversal of 84881831 is 13818848.

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-84881831 is a prime.

It is a super-2 number, since 2×84881831² = 14409850467825122, 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 (84881851) 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, 633380 + ... + 633513.

It is an arithmetic number, because the mean of its divisors is an integer number (21537198).

Almost surely, 2^84881831 is an apocalyptic number.

84881831 is a deficient number, since it is larger than the sum of its proper divisors (1266961).

84881831 is a wasteful number, since it uses less digits than its factorization.

84881831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1266960.

The product of its digits is 49152, while the sum is 41.

The square root of 84881831 is about 9213.1336145744. The cubic root of 84881831 is about 439.4791201868.

The spelling of 84881831 in words is "eighty-four million, eight hundred eighty-one thousand, eight hundred thirty-one".