997148731 has 8 divisors (see below), whose sum is σ = 1050997680. Its totient is φ = 944597472.

The previous prime is 997148717. The next prime is 997148749. The reversal of 997148731 is 137841799.

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 997148731 - 2⁵ = 997148699 is a prime.

It is a super-2 number, since 2×997148731² = 1988611183469820722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997148701) 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, 322845 + ... + 325918.

It is an arithmetic number, because the mean of its divisors is an integer number (131374710).

Almost surely, 2^997148731 is an apocalyptic number.

997148731 is a deficient number, since it is larger than the sum of its proper divisors (53848949).

997148731 is a wasteful number, since it uses less digits than its factorization.

997148731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648845.

The product of its digits is 381024, while the sum is 49.

The square root of 997148731 is about 31577.6618988804. The cubic root of 997148731 is about 999.0486722625.

The spelling of 997148731 in words is "nine hundred ninety-seven million, one hundred forty-eight thousand, seven hundred thirty-one".