905423861 has 2 divisors, whose sum is σ = 905423862. Its totient is φ = 905423860.

The previous prime is 905423837. The next prime is 905423887. The reversal of 905423861 is 168324509.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 754600900 + 150822961 = 27470^2 + 12281^2 .

It is an emirp because it is prime and its reverse (168324509) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 905423861 - 2²² = 901229557 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (905423801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 452711930 + 452711931.

It is an arithmetic number, because the mean of its divisors is an integer number (452711931).

Almost surely, 2^905423861 is an apocalyptic number.

It is an amenable number.

905423861 is a deficient number, since it is larger than the sum of its proper divisors (1).

905423861 is an equidigital number, since it uses as much as digits as its factorization.

905423861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 905423861 is about 30090.2618965007. The cubic root of 905423861 is about 967.4250126277.

The spelling of 905423861 in words is "nine hundred five million, four hundred twenty-three thousand, eight hundred sixty-one".