86958981 has 8 divisors (see below), whose sum is σ = 128828160. Its totient is φ = 57972636.

The previous prime is 86958941. The next prime is 86958983. The reversal of 86958981 is 18985968.

It is not a de Polignac number, because 86958981 - 2⁷ = 86958853 is a prime.

It is a super-2 number, since 2×86958981² = 15123728753116722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86958983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1610325 + ... + 1610378.

It is an arithmetic number, because the mean of its divisors is an integer number (16103520).

Almost surely, 2^86958981 is an apocalyptic number.

It is an amenable number.

86958981 is a deficient number, since it is larger than the sum of its proper divisors (41869179).

86958981 is a wasteful number, since it uses less digits than its factorization.

86958981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3220712 (or 3220706 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 54.

The square root of 86958981 is about 9325.1799446445. The cubic root of 86958981 is about 443.0351124701.

The spelling of 86958981 in words is "eighty-six million, nine hundred fifty-eight thousand, nine hundred eighty-one".