997455391 has 8 divisors (see below), whose sum is σ = 1030195584. Its totient is φ = 965149080.

The previous prime is 997455373. The next prime is 997455397. The reversal of 997455391 is 193554799.

It is a happy number.

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 997455391 - 2⁹ = 997454879 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 (997455397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103795 + ... + 112996.

It is an arithmetic number, because the mean of its divisors is an integer number (128774448).

Almost surely, 2^997455391 is an apocalyptic number.

997455391 is a deficient number, since it is larger than the sum of its proper divisors (32740193).

997455391 is a wasteful number, since it uses less digits than its factorization.

997455391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216941.

The product of its digits is 1530900, while the sum is 52.

The square root of 997455391 is about 31582.5171732717. The cubic root of 997455391 is about 999.1510765329.

The spelling of 997455391 in words is "nine hundred ninety-seven million, four hundred fifty-five thousand, three hundred ninety-one".