90634231097 has 2 divisors, whose sum is σ = 90634231098. Its totient is φ = 90634231096.

The previous prime is 90634231031. The next prime is 90634231111. The reversal of 90634231097 is 79013243609.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68491600681 + 22142630416 = 261709^2 + 148804^2 .

It is an emirp because it is prime and its reverse (79013243609) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90634231097 - 2¹⁰ = 90634230073 is a prime.

It is not a weakly prime, because it can be changed into another prime (90634231027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45317115548 + 45317115549.

It is an arithmetic number, because the mean of its divisors is an integer number (45317115549).

Almost surely, 2^90634231097 is an apocalyptic number.

It is an amenable number.

90634231097 is a deficient number, since it is larger than the sum of its proper divisors (1).

90634231097 is an equidigital number, since it uses as much as digits as its factorization.

90634231097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 244944, while the sum is 44.

The spelling of 90634231097 in words is "ninety billion, six hundred thirty-four million, two hundred thirty-one thousand, ninety-seven".