997075789 has 4 divisors (see below), whose sum is σ = 1055727324. Its totient is φ = 938424256.

The previous prime is 997075759. The next prime is 997075817. The reversal of 997075789 is 987570799.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 462680100 + 534395689 = 21510^2 + 23117^2 .

It is a cyclic number.

It is not a de Polignac number, because 997075789 - 2²³ = 988687181 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 (997075759) 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, 29325742 + ... + 29325775.

It is an arithmetic number, because the mean of its divisors is an integer number (263931831).

Almost surely, 2^997075789 is an apocalyptic number.

It is an amenable number.

997075789 is a deficient number, since it is larger than the sum of its proper divisors (58651535).

997075789 is a wasteful number, since it uses less digits than its factorization.

997075789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58651534.

The product of its (nonzero) digits is 10001880, while the sum is 61.

The square root of 997075789 is about 31576.5069157435. The cubic root of 997075789 is about 999.0243113412.

The spelling of 997075789 in words is "nine hundred ninety-seven million, seventy-five thousand, seven hundred eighty-nine".