919901 has 2 divisors, whose sum is σ = 919902. Its totient is φ = 919900.

The previous prime is 919883. The next prime is 919903. The reversal of 919901 is 109919.

919901 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 763876 + 156025 = 874^2 + 395^2 .

It is an emirp because it is prime and its reverse (109919) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 919901 - 2¹⁰ = 918877 is a prime.

Together with 919903, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 919901.

It is not a weakly prime, because it can be changed into another prime (919903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459950 + 459951.

It is an arithmetic number, because the mean of its divisors is an integer number (459951).

2⁹¹⁹⁹⁰¹ is an apocalyptic number.

It is an amenable number.

919901 is a deficient number, since it is larger than the sum of its proper divisors (1).

919901 is an equidigital number, since it uses as much as digits as its factorization.

919901 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 919901 is about 959.1146959566. The cubic root of 919901 is about 97.2553938629.

The spelling of 919901 in words is "nine hundred nineteen thousand, nine hundred one".