999764231 has 2 divisors, whose sum is σ = 999764232. Its totient is φ = 999764230.

The previous prime is 999764219. The next prime is 999764251. The reversal of 999764231 is 132467999.

It is a weak prime.

It is an emirp because it is prime and its reverse (132467999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999764231 - 2¹⁰ = 999763207 is a prime.

It is a super-2 number, since 2×999764231² = 1999057035174042722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 999764231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999764201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499882115 + 499882116.

It is an arithmetic number, because the mean of its divisors is an integer number (499882116).

Almost surely, 2^999764231 is an apocalyptic number.

999764231 is a deficient number, since it is larger than the sum of its proper divisors (1).

999764231 is an equidigital number, since it uses as much as digits as its factorization.

999764231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 734832, while the sum is 50.

The square root of 999764231 is about 31619.0485467226. The cubic root of 999764231 is about 999.9214041562.

The spelling of 999764231 in words is "nine hundred ninety-nine million, seven hundred sixty-four thousand, two hundred thirty-one".