999932491 has 2 divisors, whose sum is σ = 999932492. Its totient is φ = 999932490.

The previous prime is 999932489. The next prime is 999932519. The reversal of 999932491 is 194239999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999932491 - 2¹ = 999932489 is a prime.

Together with 999932489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (999932471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499966245 + 499966246.

It is an arithmetic number, because the mean of its divisors is an integer number (499966246).

Almost surely, 2^999932491 is an apocalyptic number.

999932491 is a deficient number, since it is larger than the sum of its proper divisors (1).

999932491 is an equidigital number, since it uses as much as digits as its factorization.

999932491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1417176, while the sum is 55.

The square root of 999932491 is about 31621.7091726554. The cubic root of 999932491 is about 999.9774964936.

The spelling of 999932491 in words is "nine hundred ninety-nine million, nine hundred thirty-two thousand, four hundred ninety-one".