901923109 has 2 divisors, whose sum is σ = 901923110. Its totient is φ = 901923108.

The previous prime is 901923107. The next prime is 901923149. The reversal of 901923109 is 901329109.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 680062084 + 221861025 = 26078^2 + 14895^2 .

It is an emirp because it is prime and its reverse (901329109) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 901923109 - 2¹ = 901923107 is a prime.

Together with 901923107, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (901923107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 450961554 + 450961555.

It is an arithmetic number, because the mean of its divisors is an integer number (450961555).

Almost surely, 2^901923109 is an apocalyptic number.

It is an amenable number.

901923109 is a deficient number, since it is larger than the sum of its proper divisors (1).

901923109 is an equidigital number, since it uses as much as digits as its factorization.

901923109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4374, while the sum is 34.

The square root of 901923109 is about 30032.0347129528. The cubic root of 901923109 is about 966.1765773483.

The spelling of 901923109 in words is "nine hundred one million, nine hundred twenty-three thousand, one hundred nine".