86691523 has 2 divisors, whose sum is σ = 86691524. Its totient is φ = 86691522.

The previous prime is 86691503. The next prime is 86691533. The reversal of 86691523 is 32519668.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 86691523 - 2⁵ = 86691491 is a prime.

It is not a weakly prime, because it can be changed into another prime (86691503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43345761 + 43345762.

It is an arithmetic number, because the mean of its divisors is an integer number (43345762).

Almost surely, 2^86691523 is an apocalyptic number.

86691523 is a deficient number, since it is larger than the sum of its proper divisors (1).

86691523 is an equidigital number, since it uses as much as digits as its factorization.

86691523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 40.

The square root of 86691523 is about 9310.8282660567. The cubic root of 86691523 is about 442.5804345893.

The spelling of 86691523 in words is "eighty-six million, six hundred ninety-one thousand, five hundred twenty-three".