90109693237 has 2 divisors, whose sum is σ = 90109693238. Its totient is φ = 90109693236.

The previous prime is 90109693123. The next prime is 90109693243. The reversal of 90109693237 is 73239690109.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64520572081 + 25589121156 = 254009^2 + 159966^2 .

It is an emirp because it is prime and its reverse (73239690109) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90109693237 - 2¹⁹ = 90109168949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90109693337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45054846618 + 45054846619.

It is an arithmetic number, because the mean of its divisors is an integer number (45054846619).

Almost surely, 2^90109693237 is an apocalyptic number.

It is an amenable number.

90109693237 is a deficient number, since it is larger than the sum of its proper divisors (1).

90109693237 is an equidigital number, since it uses as much as digits as its factorization.

90109693237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 551124, while the sum is 49.

The spelling of 90109693237 in words is "ninety billion, one hundred nine million, six hundred ninety-three thousand, two hundred thirty-seven".