281259454921 has 3 divisors (see below), whose sum is σ = 281259985261. Its totient is φ = 281258924582.

The previous prime is 281259454913. The next prime is 281259454937. The reversal of 281259454921 is 129454952182.

The square root of 281259454921 is 530339.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 281259454921 - 2³ = 281259454913 is a prime.

It is a super-2 number, since 2×281259454921² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (281259454121) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 265170 + ... + 795508.

Almost surely, 2^281259454921 is an apocalyptic number.

281259454921 is the 530339-th square number.

281259454921 is the 265170-th centered octagonal number.

It is an amenable number.

281259454921 is a deficient number, since it is larger than the sum of its proper divisors (530340).

281259454921 is an frugal number, since it uses more digits than its factorization.

281259454921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1060678 (or 530339 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 52.

The spelling of 281259454921 in words is "two hundred eighty-one billion, two hundred fifty-nine million, four hundred fifty-four thousand, nine hundred twenty-one".