997808013 has 24 divisors (see below), whose sum is σ = 1527552000. Its totient is φ = 625463424.

The previous prime is 997807997. The next prime is 997808029. The reversal of 997808013 is 310808799.

It is an interprime number because it is at equal distance from previous prime (997807997) and next prime (997808029).

It is not a de Polignac number, because 997808013 - 2⁴ = 997807997 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 997808013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997808033) 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 in 23 ways as a sum of consecutive naturals, for example, 193138 + ... + 198236.

It is an arithmetic number, because the mean of its divisors is an integer number (63648000).

Almost surely, 2^997808013 is an apocalyptic number.

It is an amenable number.

997808013 is a deficient number, since it is larger than the sum of its proper divisors (529743987).

997808013 is a wasteful number, since it uses less digits than its factorization.

997808013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6401 (or 6398 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 997808013 is about 31588.0992305647. The cubic root of 997808013 is about 999.2688031481.

The spelling of 997808013 in words is "nine hundred ninety-seven million, eight hundred eight thousand, thirteen".