86158421 has 2 divisors, whose sum is σ = 86158422. Its totient is φ = 86158420.

The previous prime is 86158409. The next prime is 86158439. The reversal of 86158421 is 12485168.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81252196 + 4906225 = 9014^2 + 2215^2 .

It is a cyclic number.

It is not a de Polignac number, because 86158421 - 2¹⁰ = 86157397 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86158321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43079210 + 43079211.

It is an arithmetic number, because the mean of its divisors is an integer number (43079211).

Almost surely, 2^86158421 is an apocalyptic number.

It is an amenable number.

86158421 is a deficient number, since it is larger than the sum of its proper divisors (1).

86158421 is an equidigital number, since it uses as much as digits as its factorization.

86158421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15360, while the sum is 35.

The square root of 86158421 is about 9282.1560534178. The cubic root of 86158421 is about 441.6713652916.

The spelling of 86158421 in words is "eighty-six million, one hundred fifty-eight thousand, four hundred twenty-one".