84199931 has 4 divisors (see below), whose sum is σ = 85214472. Its totient is φ = 83185392.

The previous prime is 84199883. The next prime is 84199949. The reversal of 84199931 is 13999148.

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-84199931 is a prime.

It is a super-2 number, since 2×84199931² = 14179256760809522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84199961) 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, 507146 + ... + 507311.

It is an arithmetic number, because the mean of its divisors is an integer number (21303618).

Almost surely, 2^84199931 is an apocalyptic number.

84199931 is a deficient number, since it is larger than the sum of its proper divisors (1014541).

84199931 is a wasteful number, since it uses less digits than its factorization.

84199931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1014540.

The product of its digits is 69984, while the sum is 44.

The square root of 84199931 is about 9176.0520377775. The cubic root of 84199931 is about 438.2990996539.

The spelling of 84199931 in words is "eighty-four million, one hundred ninety-nine thousand, nine hundred thirty-one".