997181447 has 4 divisors (see below), whose sum is σ = 997665480. Its totient is φ = 996697416.

The previous prime is 997181431. The next prime is 997181453. The reversal of 997181447 is 744181799.

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

It is a cyclic number.

It is not a de Polignac number, because 997181447 - 2⁴ = 997181431 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 997181395 and 997181404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997181407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 238913 + ... + 243050.

It is an arithmetic number, because the mean of its divisors is an integer number (249416370).

Almost surely, 2^997181447 is an apocalyptic number.

997181447 is a deficient number, since it is larger than the sum of its proper divisors (484033).

997181447 is a wasteful number, since it uses less digits than its factorization.

997181447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484032.

The product of its digits is 508032, while the sum is 50.

The square root of 997181447 is about 31578.1799190517. The cubic root of 997181447 is about 999.0595982551.

The spelling of 997181447 in words is "nine hundred ninety-seven million, one hundred eighty-one thousand, four hundred forty-seven".