90616891 has 2 divisors, whose sum is σ = 90616892. Its totient is φ = 90616890.

The previous prime is 90616859. The next prime is 90616901. The reversal of 90616891 is 19861609.

It is a strong prime.

It is an emirp because it is prime and its reverse (19861609) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90616891 - 2⁵ = 90616859 is a prime.

It is a super-2 number, since 2×90616891² = 16422841869011762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (90616831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45308445 + 45308446.

It is an arithmetic number, because the mean of its divisors is an integer number (45308446).

Almost surely, 2^90616891 is an apocalyptic number.

90616891 is a deficient number, since it is larger than the sum of its proper divisors (1).

90616891 is an equidigital number, since it uses as much as digits as its factorization.

90616891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 90616891 is about 9519.2904672565. The cubic root of 90616891 is about 449.1620471864.

The spelling of 90616891 in words is "ninety million, six hundred sixteen thousand, eight hundred ninety-one".