86790221509 has 2 divisors, whose sum is σ = 86790221510. Its totient is φ = 86790221508.

The previous prime is 86790221503. The next prime is 86790221549. The reversal of 86790221509 is 90512209768.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49660785409 + 37129436100 = 222847^2 + 192690^2 .

It is a cyclic number.

It is not a de Polignac number, because 86790221509 - 2⁷ = 86790221381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86790221503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43395110754 + 43395110755.

It is an arithmetic number, because the mean of its divisors is an integer number (43395110755).

Almost surely, 2^86790221509 is an apocalyptic number.

It is an amenable number.

86790221509 is a deficient number, since it is larger than the sum of its proper divisors (1).

86790221509 is an equidigital number, since it uses as much as digits as its factorization.

86790221509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 544320, while the sum is 49.

The spelling of 86790221509 in words is "eighty-six billion, seven hundred ninety million, two hundred twenty-one thousand, five hundred nine".