991332230233 has 2 divisors, whose sum is σ = 991332230234. Its totient is φ = 991332230232.

The previous prime is 991332230201. The next prime is 991332230263. The reversal of 991332230233 is 332032233199.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 963532670409 + 27799559824 = 981597^2 + 166732^2 .

It is a cyclic number.

It is not a de Polignac number, because 991332230233 - 2⁵ = 991332230201 is a prime.

It is not a weakly prime, because it can be changed into another prime (991332230263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495666115116 + 495666115117.

It is an arithmetic number, because the mean of its divisors is an integer number (495666115117).

Almost surely, 2^991332230233 is an apocalyptic number.

It is an amenable number.

991332230233 is a deficient number, since it is larger than the sum of its proper divisors (1).

991332230233 is an equidigital number, since it uses as much as digits as its factorization.

991332230233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 157464, while the sum is 40.

The spelling of 991332230233 in words is "nine hundred ninety-one billion, three hundred thirty-two million, two hundred thirty thousand, two hundred thirty-three".