201999923 has 2 divisors, whose sum is σ = 201999924. Its totient is φ = 201999922.

The previous prime is 201999913. The next prime is 201999929. The reversal of 201999923 is 329999102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201999923 - 2⁸ = 201999667 is a prime.

It is not a weakly prime, because it can be changed into another prime (201999929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100999961 + 100999962.

It is an arithmetic number, because the mean of its divisors is an integer number (100999962).

Almost surely, 2^201999923 is an apocalyptic number.

201999923 is a deficient number, since it is larger than the sum of its proper divisors (1).

201999923 is an equidigital number, since it uses as much as digits as its factorization.

201999923 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 78732, while the sum is 44.

The square root of 201999923 is about 14212.6676947011. The cubic root of 201999923 is about 586.7463562907.

The spelling of 201999923 in words is "two hundred one million, nine hundred ninety-nine thousand, nine hundred twenty-three".