921172663 has 2 divisors, whose sum is σ = 921172664. Its totient is φ = 921172662.

The previous prime is 921172661. The next prime is 921172691. The reversal of 921172663 is 366271129.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 921172663 - 2¹ = 921172661 is a prime.

Together with 921172661, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (921172661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460586331 + 460586332.

It is an arithmetic number, because the mean of its divisors is an integer number (460586332).

Almost surely, 2^921172663 is an apocalyptic number.

921172663 is a deficient number, since it is larger than the sum of its proper divisors (1).

921172663 is an equidigital number, since it uses as much as digits as its factorization.

921172663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 37.

The square root of 921172663 is about 30350.8263973158. The cubic root of 921172663 is about 973.0018822668.

The spelling of 921172663 in words is "nine hundred twenty-one million, one hundred seventy-two thousand, six hundred sixty-three".