997053391 has 8 divisors (see below), whose sum is σ = 1013883200. Its totient is φ = 980328960.

The previous prime is 997053389. The next prime is 997053401. The reversal of 997053391 is 193350799.

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 997053391 - 2¹ = 997053389 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 (997053311) 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, 7146 + ... + 45223.

It is an arithmetic number, because the mean of its divisors is an integer number (126735400).

Almost surely, 2^997053391 is an apocalyptic number.

997053391 is the 18231-st hex number.

997053391 is a deficient number, since it is larger than the sum of its proper divisors (16829809).

997053391 is a wasteful number, since it uses less digits than its factorization.

997053391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52689.

The product of its (nonzero) digits is 229635, while the sum is 46.

The square root of 997053391 is about 31576.1522513431. The cubic root of 997053391 is about 999.0168306949.

The spelling of 997053391 in words is "nine hundred ninety-seven million, fifty-three thousand, three hundred ninety-one".