997484881 has 4 divisors (see below), whose sum is σ = 999238500. Its totient is φ = 995731264.

The previous prime is 997484879. The next prime is 997484897. The reversal of 997484881 is 188484799.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 188484799 = 307 ⋅613957.

It can be written as a sum of positive squares in 2 ways, for example, as 336172225 + 661312656 = 18335^2 + 25716^2 .

It is a cyclic number.

It is not a de Polignac number, because 997484881 - 2¹ = 997484879 is a prime.

It is a super-2 number, since 2×997484881² = 1989952175647168322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997484801) 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, 875956 + ... + 877093.

It is an arithmetic number, because the mean of its divisors is an integer number (249809625).

Almost surely, 2^997484881 is an apocalyptic number.

It is an amenable number.

997484881 is a deficient number, since it is larger than the sum of its proper divisors (1753619).

997484881 is a wasteful number, since it uses less digits than its factorization.

997484881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1753618.

The product of its digits is 4644864, while the sum is 58.

The square root of 997484881 is about 31582.9840420439. The cubic root of 997484881 is about 999.1609231470.

The spelling of 997484881 in words is "nine hundred ninety-seven million, four hundred eighty-four thousand, eight hundred eighty-one".