86156381 has 2 divisors, whose sum is σ = 86156382. Its totient is φ = 86156380.

The previous prime is 86156359. The next prime is 86156401. The reversal of 86156381 is 18365168.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55741156 + 30415225 = 7466^2 + 5515^2 .

It is a cyclic number.

It is not a de Polignac number, because 86156381 - 2¹⁴ = 86139997 is a prime.

It is a super-2 number, since 2×86156381² = 14845843974034322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86156341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43078190 + 43078191.

It is an arithmetic number, because the mean of its divisors is an integer number (43078191).

Almost surely, 2^86156381 is an apocalyptic number.

It is an amenable number.

86156381 is a deficient number, since it is larger than the sum of its proper divisors (1).

86156381 is an equidigital number, since it uses as much as digits as its factorization.

86156381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 38.

The square root of 86156381 is about 9282.0461645049. The cubic root of 86156381 is about 441.6678794002.

The spelling of 86156381 in words is "eighty-six million, one hundred fifty-six thousand, three hundred eighty-one".