997082791 has 4 divisors (see below), whose sum is σ = 1029246784. Its totient is φ = 964918800.

The previous prime is 997082777. The next prime is 997082803. The reversal of 997082791 is 197280799.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 197280799 = 1249 ⋅157951.

It is a cyclic number.

It is not a de Polignac number, because 997082791 - 2²³ = 988694183 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 (997082711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16081950 + ... + 16082011.

It is an arithmetic number, because the mean of its divisors is an integer number (257311696).

Almost surely, 2^997082791 is an apocalyptic number.

997082791 is a deficient number, since it is larger than the sum of its proper divisors (32163993).

997082791 is a wasteful number, since it uses less digits than its factorization.

997082791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32163992.

The product of its (nonzero) digits is 571536, while the sum is 52.

The square root of 997082791 is about 31576.6177891173. The cubic root of 997082791 is about 999.0266498970.

The spelling of 997082791 in words is "nine hundred ninety-seven million, eighty-two thousand, seven hundred ninety-one".