997485857 has 2 divisors, whose sum is σ = 997485858. Its totient is φ = 997485856.

The previous prime is 997485851. The next prime is 997485869. The reversal of 997485857 is 758584799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 659256976 + 338228881 = 25676^2 + 18391^2 .

It is a cyclic number.

It is not a de Polignac number, because 997485857 - 2⁶ = 997485793 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 997485857.

It is not a weakly prime, because it can be changed into another prime (997485851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498742928 + 498742929.

It is an arithmetic number, because the mean of its divisors is an integer number (498742929).

Almost surely, 2^997485857 is an apocalyptic number.

It is an amenable number.

997485857 is a deficient number, since it is larger than the sum of its proper divisors (1).

997485857 is an equidigital number, since it uses as much as digits as its factorization.

997485857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25401600, while the sum is 62.

The square root of 997485857 is about 31582.9994933983. Note that the first 3 decimals coincide. The cubic root of 997485857 is about 999.1612490268.

The spelling of 997485857 in words is "nine hundred ninety-seven million, four hundred eighty-five thousand, eight hundred fifty-seven".