997281473 has 4 divisors (see below), whose sum is σ = 998446020. Its totient is φ = 996116928.

The previous prime is 997281457. The next prime is 997281487. The reversal of 997281473 is 374182799.

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

It can be written as a sum of positive squares in 2 ways, for example, as 760490929 + 236790544 = 27577^2 + 15388^2 .

It is a cyclic number.

It is not a de Polignac number, because 997281473 - 2⁴ = 997281457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997284473) 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, 580988 + ... + 582701.

It is an arithmetic number, because the mean of its divisors is an integer number (249611505).

Almost surely, 2^997281473 is an apocalyptic number.

It is an amenable number.

997281473 is a deficient number, since it is larger than the sum of its proper divisors (1164547).

997281473 is a wasteful number, since it uses less digits than its factorization.

997281473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1164546.

The product of its digits is 762048, while the sum is 50.

The square root of 997281473 is about 31579.7636628269. The cubic root of 997281473 is about 999.0930019366.

The spelling of 997281473 in words is "nine hundred ninety-seven million, two hundred eighty-one thousand, four hundred seventy-three".