997747147 has 4 divisors (see below), whose sum is σ = 1004354896. Its totient is φ = 991139400.

The previous prime is 997747129. The next prime is 997747151. The reversal of 997747147 is 741747799.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 741747799 = 13 ⋅57057523.

It is a cyclic number.

It is not a de Polignac number, because 997747147 - 2¹⁹ = 997222859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997747547) 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, 3303648 + ... + 3303949.

It is an arithmetic number, because the mean of its divisors is an integer number (251088724).

Almost surely, 2^997747147 is an apocalyptic number.

997747147 is a deficient number, since it is larger than the sum of its proper divisors (6607749).

997747147 is a wasteful number, since it uses less digits than its factorization.

997747147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6607748.

The product of its digits is 3111696, while the sum is 55.

The square root of 997747147 is about 31587.1357834166. The cubic root of 997747147 is about 999.2484843657.

The spelling of 997747147 in words is "nine hundred ninety-seven million, seven hundred forty-seven thousand, one hundred forty-seven".