997647511 has 8 divisors (see below), whose sum is σ = 1140950304. Its totient is φ = 854540160.

The previous prime is 997647509. The next prime is 997647527. The reversal of 997647511 is 115746799.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 997647511 - 2¹ = 997647509 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 (997642511) 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 7 ways as a sum of consecutive naturals, for example, 37750 + ... + 58483.

It is an arithmetic number, because the mean of its divisors is an integer number (142618788).

Almost surely, 2^997647511 is an apocalyptic number.

997647511 is a deficient number, since it is larger than the sum of its proper divisors (143302793).

997647511 is a wasteful number, since it uses less digits than its factorization.

997647511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97721.

The product of its digits is 476280, while the sum is 49.

The square root of 997647511 is about 31585.5585829980. The cubic root of 997647511 is about 999.2152212835.

The spelling of 997647511 in words is "nine hundred ninety-seven million, six hundred forty-seven thousand, five hundred eleven".