90145919 has 2 divisors, whose sum is σ = 90145920. Its totient is φ = 90145918.

The previous prime is 90145907. The next prime is 90145927. The reversal of 90145919 is 91954109.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90145919 - 2⁸ = 90145663 is a prime.

It is a super-2 number, since 2×90145919² = 16252573424709122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90145969) by changing a digit.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45072959 + 45072960.

It is an arithmetic number, because the mean of its divisors is an integer number (45072960).

Almost surely, 2^90145919 is an apocalyptic number.

90145919 is a deficient number, since it is larger than the sum of its proper divisors (1).

90145919 is an equidigital number, since it uses as much as digits as its factorization.

90145919 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14580, while the sum is 38.

The square root of 90145919 is about 9494.5204723567. The cubic root of 90145919 is about 448.3825372524.

The spelling of 90145919 in words is "ninety million, one hundred forty-five thousand, nine hundred nineteen".