90684019 has 2 divisors, whose sum is σ = 90684020. Its totient is φ = 90684018.

The previous prime is 90683993. The next prime is 90684023. The reversal of 90684019 is 91048609.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90684019 - 2⁵ = 90683987 is a prime.

It is a super-2 number, since 2×90684019² = 16447182603984722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (90684029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45342009 + 45342010.

It is an arithmetic number, because the mean of its divisors is an integer number (45342010).

Almost surely, 2^90684019 is an apocalyptic number.

90684019 is a deficient number, since it is larger than the sum of its proper divisors (1).

90684019 is an equidigital number, since it uses as much as digits as its factorization.

90684019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 90684019 is about 9522.8157075520. The cubic root of 90684019 is about 449.2729312514.

The spelling of 90684019 in words is "ninety million, six hundred eighty-four thousand, nineteen".