921311233 has 2 divisors, whose sum is σ = 921311234. Its totient is φ = 921311232.

The previous prime is 921311221. The next prime is 921311263. The reversal of 921311233 is 332113129.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 889411329 + 31899904 = 29823^2 + 5648^2 .

It is a cyclic number.

It is not a de Polignac number, because 921311233 - 2⁵ = 921311201 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 921311198 and 921311207.

It is not a weakly prime, because it can be changed into another prime (921311263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460655616 + 460655617.

It is an arithmetic number, because the mean of its divisors is an integer number (460655617).

Almost surely, 2^921311233 is an apocalyptic number.

It is an amenable number.

921311233 is a deficient number, since it is larger than the sum of its proper divisors (1).

921311233 is an equidigital number, since it uses as much as digits as its factorization.

921311233 is an evil number, because the sum of its binary digits is even.

The product of its digits is 972, while the sum is 25.

The square root of 921311233 is about 30353.1091158715. The cubic root of 921311233 is about 973.0506686728.

The spelling of 921311233 in words is "nine hundred twenty-one million, three hundred eleven thousand, two hundred thirty-three".