997945147 has 4 divisors (see below), whose sum is σ = 998037040. Its totient is φ = 997853256.

The previous prime is 997945141. The next prime is 997945153. The reversal of 997945147 is 741549799.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (997945141) and next prime (997945153).

It is a cyclic number.

It is not a de Polignac number, because 997945147 - 2²³ = 989556539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997945141) 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, 27072 + ... + 52237.

It is an arithmetic number, because the mean of its divisors is an integer number (249509260).

Almost surely, 2^997945147 is an apocalyptic number.

997945147 is a deficient number, since it is larger than the sum of its proper divisors (91893).

997945147 is a wasteful number, since it uses less digits than its factorization.

997945147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91892.

The product of its digits is 2857680, while the sum is 55.

The square root of 997945147 is about 31590.2698152453. The cubic root of 997945147 is about 999.3145793058.

The spelling of 997945147 in words is "nine hundred ninety-seven million, nine hundred forty-five thousand, one hundred forty-seven".