997513849 has 2 divisors, whose sum is σ = 997513850. Its totient is φ = 997513848.

The previous prime is 997513831. The next prime is 997513883. The reversal of 997513849 is 948315799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 819104400 + 178409449 = 28620^2 + 13357^2 .

It is a cyclic number.

It is not a de Polignac number, because 997513849 - 2⁵ = 997513817 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 997513849.

It is not a weakly prime, because it can be changed into another prime (997513249) 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, 498756924 + 498756925.

It is an arithmetic number, because the mean of its divisors is an integer number (498756925).

Almost surely, 2^997513849 is an apocalyptic number.

It is an amenable number.

997513849 is a deficient number, since it is larger than the sum of its proper divisors (1).

997513849 is an equidigital number, since it uses as much as digits as its factorization.

997513849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2449440, while the sum is 55.

The square root of 997513849 is about 31583.4426400923. The cubic root of 997513849 is about 999.1705952780.

The spelling of 997513849 in words is "nine hundred ninety-seven million, five hundred thirteen thousand, eight hundred forty-nine".