86861257 has 4 divisors (see below), whose sum is σ = 99270016. Its totient is φ = 74452500.

The previous prime is 86861231. The next prime is 86861263. The reversal of 86861257 is 75216868.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 86861257 - 2²³ = 78472649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86861207) 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, 6204369 + ... + 6204382.

It is an arithmetic number, because the mean of its divisors is an integer number (24817504).

Almost surely, 2^86861257 is an apocalyptic number.

It is an amenable number.

86861257 is a deficient number, since it is larger than the sum of its proper divisors (12408759).

86861257 is a wasteful number, since it uses less digits than its factorization.

86861257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12408758.

The product of its digits is 161280, while the sum is 43.

The square root of 86861257 is about 9319.9386800558. The cubic root of 86861257 is about 442.8690901638.

The spelling of 86861257 in words is "eighty-six million, eight hundred sixty-one thousand, two hundred fifty-seven".