997457899 has 2 divisors, whose sum is σ = 997457900. Its totient is φ = 997457898.

The previous prime is 997457897. The next prime is 997457917. The reversal of 997457899 is 998754799.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 997457899 - 2¹ = 997457897 is a prime.

Together with 997457897, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (997457897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498728949 + 498728950.

It is an arithmetic number, because the mean of its divisors is an integer number (498728950).

Almost surely, 2^997457899 is an apocalyptic number.

997457899 is a deficient number, since it is larger than the sum of its proper divisors (1).

997457899 is an equidigital number, since it uses as much as digits as its factorization.

997457899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51438240, while the sum is 67.

The square root of 997457899 is about 31582.5568787582. The cubic root of 997457899 is about 999.1519139534.

The spelling of 997457899 in words is "nine hundred ninety-seven million, four hundred fifty-seven thousand, eight hundred ninety-nine".