920999999 has 2 divisors, whose sum is σ = 921000000. Its totient is φ = 920999998.

The previous prime is 920999993. The next prime is 921000013. The reversal of 920999999 is 999999029.

It is a weak prime.

It is an emirp because it is prime and its reverse (999999029) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 920999999 - 2⁸ = 920999743 is a prime.

It is a Chen prime.

920999999 is a modest number, since divided by 99999 gives 9209 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (920999993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460499999 + 460500000.

It is an arithmetic number, because the mean of its divisors is an integer number (460500000).

Almost surely, 2^920999999 is an apocalyptic number.

920999999 is a deficient number, since it is larger than the sum of its proper divisors (1).

920999999 is an equidigital number, since it uses as much as digits as its factorization.

920999999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9565938, while the sum is 65.

The square root of 920999999 is about 30347.9817945115. The cubic root of 920999999 is about 972.9410855231.

The spelling of 920999999 in words is "nine hundred twenty million, nine hundred ninety-nine thousand, nine hundred ninety-nine".