997905499 has 2 divisors, whose sum is σ = 997905500. Its totient is φ = 997905498.

The previous prime is 997905473. The next prime is 997905521. The reversal of 997905499 is 994509799.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997905499 is a prime.

It is not a weakly prime, because it can be changed into another prime (997975499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498952749 + 498952750.

It is an arithmetic number, because the mean of its divisors is an integer number (498952750).

Almost surely, 2^997905499 is an apocalyptic number.

997905499 is a deficient number, since it is larger than the sum of its proper divisors (1).

997905499 is an equidigital number, since it uses as much as digits as its factorization.

997905499 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8266860, while the sum is 61.

The square root of 997905499 is about 31589.6422740113. The cubic root of 997905499 is about 999.3013449949.

The spelling of 997905499 in words is "nine hundred ninety-seven million, nine hundred five thousand, four hundred ninety-nine".