86981031 has 12 divisors (see below), whose sum is σ = 132252120. Its totient is φ = 54935280.

The previous prime is 86981029. The next prime is 86981051. The reversal of 86981031 is 13018968.

It is not a de Polignac number, because 86981031 - 2¹ = 86981029 is a prime.

It is a super-2 number, since 2×86981031² = 15131399507645922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86981051) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 254160 + ... + 254501.

It is an arithmetic number, because the mean of its divisors is an integer number (11021010).

Almost surely, 2^86981031 is an apocalyptic number.

86981031 is a deficient number, since it is larger than the sum of its proper divisors (45271089).

86981031 is a wasteful number, since it uses less digits than its factorization.

86981031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508686 (or 508683 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 86981031 is about 9326.3621525223. The cubic root of 86981031 is about 443.0725557893.

Adding to 86981031 its reverse (13018968), we get a palindrome (99999999).

The spelling of 86981031 in words is "eighty-six million, nine hundred eighty-one thousand, thirty-one".