997472731 has 8 divisors (see below), whose sum is σ = 1006079184. Its totient is φ = 988903680.

The previous prime is 997472701. The next prime is 997472741. The reversal of 997472731 is 137274799.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997472731 is a prime.

It is a super-2 number, since 2×997472731² = 1989903698177196722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997472701) 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, 45591 + ... + 63823.

It is an arithmetic number, because the mean of its divisors is an integer number (125759898).

Almost surely, 2^997472731 is an apocalyptic number.

997472731 is a deficient number, since it is larger than the sum of its proper divisors (8606453).

997472731 is a wasteful number, since it uses less digits than its factorization.

997472731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18701.

The product of its digits is 666792, while the sum is 49.

The square root of 997472731 is about 31582.7916910459. The cubic root of 997472731 is about 999.1568663254.

The spelling of 997472731 in words is "nine hundred ninety-seven million, four hundred seventy-two thousand, seven hundred thirty-one".