90177091 has 2 divisors, whose sum is σ = 90177092. Its totient is φ = 90177090.

The previous prime is 90177079. The next prime is 90177107. The reversal of 90177091 is 19077109.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (19077109) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90177091 - 2⁹ = 90176579 is a prime.

It is not a weakly prime, because it can be changed into another prime (90177011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45088545 + 45088546.

It is an arithmetic number, because the mean of its divisors is an integer number (45088546).

Almost surely, 2^90177091 is an apocalyptic number.

90177091 is a deficient number, since it is larger than the sum of its proper divisors (1).

90177091 is an equidigital number, since it uses as much as digits as its factorization.

90177091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3969, while the sum is 34.

The square root of 90177091 is about 9496.1619088977. The cubic root of 90177091 is about 448.4342140961.

The spelling of 90177091 in words is "ninety million, one hundred seventy-seven thousand, ninety-one".