997168481 has 4 divisors (see below), whose sum is σ = 1001048772. Its totient is φ = 993288192.

The previous prime is 997168457. The next prime is 997168489. The reversal of 997168481 is 184861799.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 184861799 = 139 ⋅1329941.

It can be written as a sum of positive squares in 2 ways, for example, as 625450081 + 371718400 = 25009^2 + 19280^2 .

It is a cyclic number.

It is not a de Polignac number, because 997168481 - 2²⁶ = 930059617 is a prime.

It is a super-2 number, since 2×997168481² = 1988689958999694722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997168489) 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, 1939760 + ... + 1940273.

It is an arithmetic number, because the mean of its divisors is an integer number (250262193).

Almost surely, 2^997168481 is an apocalyptic number.

It is an amenable number.

997168481 is a deficient number, since it is larger than the sum of its proper divisors (3880291).

997168481 is a wasteful number, since it uses less digits than its factorization.

997168481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3880290.

The product of its digits is 870912, while the sum is 53.

The square root of 997168481 is about 31577.9746183950. The cubic root of 997168481 is about 999.0552680960.

The spelling of 997168481 in words is "nine hundred ninety-seven million, one hundred sixty-eight thousand, four hundred eighty-one".