281473996493 has 8 divisors (see below), whose sum is σ = 283063170936. Its totient is φ = 279885196800.

The previous prime is 281473996457. The next prime is 281473996547. The reversal of 281473996493 is 394699374182.

It can be written as a sum of positive squares in 4 ways, for example, as 35629582564 + 245844413929 = 188758^2 + 495827^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 281473996493 - 2⁶ = 281473996429 is a prime.

It is a super-2 number, since 2×281473996493² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281473996403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1487813 + ... + 1666293.

It is an arithmetic number, because the mean of its divisors is an integer number (35382896367).

Almost surely, 2^281473996493 is an apocalyptic number.

It is an amenable number.

281473996493 is a deficient number, since it is larger than the sum of its proper divisors (1589174443).

281473996493 is a wasteful number, since it uses less digits than its factorization.

281473996493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187375.

The product of its digits is 70543872, while the sum is 65.

The spelling of 281473996493 in words is "two hundred eighty-one billion, four hundred seventy-three million, nine hundred ninety-six thousand, four hundred ninety-three".