905388257 has 2 divisors, whose sum is σ = 905388258. Its totient is φ = 905388256.

The previous prime is 905388233. The next prime is 905388259. The reversal of 905388257 is 752883509.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 888993856 + 16394401 = 29816^2 + 4049^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-905388257 is a prime.

Together with 905388259, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (905388259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 452694128 + 452694129.

It is an arithmetic number, because the mean of its divisors is an integer number (452694129).

Almost surely, 2^905388257 is an apocalyptic number.

It is an amenable number.

905388257 is a deficient number, since it is larger than the sum of its proper divisors (1).

905388257 is an equidigital number, since it uses as much as digits as its factorization.

905388257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 604800, while the sum is 47.

The square root of 905388257 is about 30089.6702707092. The cubic root of 905388257 is about 967.4123317706.

The spelling of 905388257 in words is "nine hundred five million, three hundred eighty-eight thousand, two hundred fifty-seven".