997536511 has 4 divisors (see below), whose sum is σ = 1003302792. Its totient is φ = 991770232.

The previous prime is 997536509. The next prime is 997536521. The reversal of 997536511 is 115635799.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 997536511 - 2¹ = 997536509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997536521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2882881 + ... + 2883226.

It is an arithmetic number, because the mean of its divisors is an integer number (250825698).

Almost surely, 2^997536511 is an apocalyptic number.

997536511 is a deficient number, since it is larger than the sum of its proper divisors (5766281).

997536511 is a wasteful number, since it uses less digits than its factorization.

997536511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5766280.

The product of its digits is 255150, while the sum is 46.

The square root of 997536511 is about 31583.8014019845. The cubic root of 997536511 is about 999.1781617669.

The spelling of 997536511 in words is "nine hundred ninety-seven million, five hundred thirty-six thousand, five hundred eleven".