90155335091 has 2 divisors, whose sum is σ = 90155335092. Its totient is φ = 90155335090.

The previous prime is 90155335037. The next prime is 90155335097. The reversal of 90155335091 is 19053355109.

It is a strong prime.

It is an emirp because it is prime and its reverse (19053355109) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90155335091 is a prime.

It is not a weakly prime, because it can be changed into another prime (90155335097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45077667545 + 45077667546.

It is an arithmetic number, because the mean of its divisors is an integer number (45077667546).

Almost surely, 2^90155335091 is an apocalyptic number.

90155335091 is a deficient number, since it is larger than the sum of its proper divisors (1).

90155335091 is an equidigital number, since it uses as much as digits as its factorization.

90155335091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 91125, while the sum is 41.

The spelling of 90155335091 in words is "ninety billion, one hundred fifty-five million, three hundred thirty-five thousand, ninety-one".