997231787 has 8 divisors (see below), whose sum is σ = 1036514640. Its totient is φ = 958275360.

The previous prime is 997231783. The next prime is 997231789. The reversal of 997231787 is 787132799.

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 997231787 - 2² = 997231783 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997231783) 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, 75368 + ... + 87605.

It is an arithmetic number, because the mean of its divisors is an integer number (129564330).

Almost surely, 2^997231787 is an apocalyptic number.

997231787 is a deficient number, since it is larger than the sum of its proper divisors (39282853).

997231787 is a wasteful number, since it uses less digits than its factorization.

997231787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163213.

The product of its digits is 1333584, while the sum is 53.

The square root of 997231787 is about 31578.9769783633. The cubic root of 997231787 is about 999.0764095767.

The spelling of 997231787 in words is "nine hundred ninety-seven million, two hundred thirty-one thousand, seven hundred eighty-seven".