997549217 has 16 divisors (see below), whose sum is σ = 1204211712. Its totient is φ = 808209360.

The previous prime is 997549211. The next prime is 997549243. The reversal of 997549217 is 712945799.

It is not a de Polignac number, because 997549217 - 2²⁰ = 996500641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997549211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44123 + ... + 62784.

It is an arithmetic number, because the mean of its divisors is an integer number (75263232).

Almost surely, 2^997549217 is an apocalyptic number.

It is an amenable number.

997549217 is a deficient number, since it is larger than the sum of its proper divisors (206662495).

997549217 is a wasteful number, since it uses less digits than its factorization.

997549217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106988.

The product of its digits is 1428840, while the sum is 53.

The square root of 997549217 is about 31584.0025487588. The cubic root of 997549217 is about 999.1824040524.

The spelling of 997549217 in words is "nine hundred ninety-seven million, five hundred forty-nine thousand, two hundred seventeen".