90939619 has 2 divisors, whose sum is σ = 90939620. Its totient is φ = 90939618.

The previous prime is 90939571. The next prime is 90939637. The reversal of 90939619 is 91693909.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90939619 is a prime.

It is a super-2 number, since 2×90939619² = 16540028607730322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (90939659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45469809 + 45469810.

It is an arithmetic number, because the mean of its divisors is an integer number (45469810).

Almost surely, 2^90939619 is an apocalyptic number.

90939619 is a deficient number, since it is larger than the sum of its proper divisors (1).

90939619 is an equidigital number, since it uses as much as digits as its factorization.

90939619 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 118098, while the sum is 46.

The square root of 90939619 is about 9536.2266646719. The cubic root of 90939619 is about 449.6946389254.

The spelling of 90939619 in words is "ninety million, nine hundred thirty-nine thousand, six hundred nineteen".