919900001 has 2 divisors, whose sum is σ = 919900002. Its totient is φ = 919900000.

The previous prime is 919899979. The next prime is 919900043. The reversal of 919900001 is 100009919.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 826275025 + 93624976 = 28745^2 + 9676^2 .

It is a cyclic number.

It is not a de Polignac number, because 919900001 - 2¹⁰ = 919898977 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (919900061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459950000 + 459950001.

It is an arithmetic number, because the mean of its divisors is an integer number (459950001).

Almost surely, 2^919900001 is an apocalyptic number.

It is an amenable number.

919900001 is a deficient number, since it is larger than the sum of its proper divisors (1).

919900001 is an equidigital number, since it uses as much as digits as its factorization.

919900001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 729, while the sum is 29.

The square root of 919900001 is about 30329.8532967108. The cubic root of 919900001 is about 972.5535865688.

The spelling of 919900001 in words is "nine hundred nineteen million, nine hundred thousand, one".