86890031 has 6 divisors (see below), whose sum is σ = 87286032. Its totient is φ = 86495360.

The previous prime is 86890019. The next prime is 86890033. The reversal of 86890031 is 13009868.

It is a de Polignac number, because none of the positive numbers 2^k-86890031 is a prime.

It is a super-2 number, since 2×86890031² = 15099754974361922, 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 = 86889973 and 86890000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86890033) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 193295 + ... + 193743.

It is an arithmetic number, because the mean of its divisors is an integer number (14547672).

Almost surely, 2^86890031 is an apocalyptic number.

86890031 is a deficient number, since it is larger than the sum of its proper divisors (396001).

86890031 is an frugal number, since it uses more digits than its factorization.

86890031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1329 (or 880 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 86890031 is about 9321.4822319200. The cubic root of 86890031 is about 442.9179869477.

Adding to 86890031 its reverse (13009868), we get a palindrome (99899899).

The spelling of 86890031 in words is "eighty-six million, eight hundred ninety thousand, thirty-one".