18950000281 has 3 divisors (see below), whose sum is σ = 18950137941. Its totient is φ = 18949862622.

The previous prime is 18950000263. The next prime is 18950000287. The reversal of 18950000281 is 18200005981.

The square root of 18950000281 is 137659.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18200005981 = 5749 ⋅3165769.

It is not a de Polignac number, because 18950000281 - 2¹¹ = 18949998233 is a prime.

It is a super-2 number, since 2×18950000281² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18950000287) 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, 68830 + ... + 206488.

It is an arithmetic number, because the mean of its divisors is an integer number (6316712647).

Almost surely, 2^18950000281 is an apocalyptic number.

18950000281 is the 137659-th square number.

18950000281 is the 68830-th centered octagonal number.

It is an amenable number.

18950000281 is a deficient number, since it is larger than the sum of its proper divisors (137660).

18950000281 is an frugal number, since it uses more digits than its factorization.

18950000281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275318 (or 137659 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 34.

The spelling of 18950000281 in words is "eighteen billion, nine hundred fifty million, two hundred eighty-one", and thus it is an aban number.