84000031 has 4 divisors (see below), whose sum is σ = 84019464. Its totient is φ = 83980600.

The previous prime is 84000023. The next prime is 84000041. The reversal of 84000031 is 13000048.

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

It is a cyclic number.

It is not a de Polignac number, because 84000031 - 2³ = 84000023 is a prime.

It is a super-2 number, since 2×84000031² = 14112010416001922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 83999969 and 84000014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84000041) 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, 21 + ... + 12961.

It is an arithmetic number, because the mean of its divisors is an integer number (21004866).

Almost surely, 2^84000031 is an apocalyptic number.

84000031 is a deficient number, since it is larger than the sum of its proper divisors (19433).

84000031 is a wasteful number, since it uses less digits than its factorization.

84000031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19432.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 84000031 is about 9165.1530811002. The cubic root of 84000031 is about 437.9519678638.

Adding to 84000031 its reverse (13000048), we get a palindrome (97000079).

The spelling of 84000031 in words is "eighty-four million, thirty-one", and thus it is an aban number.