274229221561 has 3 divisors (see below), whose sum is σ = 274229745231. Its totient is φ = 274228697892.

The previous prime is 274229221529. The next prime is 274229221667. The reversal of 274229221561 is 165122922472.

The square root of 274229221561 is 523669.

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 can be written as a sum of positive squares in only one way, i.e., 126358209961 + 147871011600 = 355469^2 + 384540^2 .

It is not a de Polignac number, because 274229221561 - 2⁵ = 274229221529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (274229228561) 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, 261835 + ... + 785503.

It is an arithmetic number, because the mean of its divisors is an integer number (91409915077).

Almost surely, 2^274229221561 is an apocalyptic number.

274229221561 is the 523669-th square number.

274229221561 is the 261835-th centered octagonal number.

It is an amenable number.

274229221561 is a deficient number, since it is larger than the sum of its proper divisors (523670).

274229221561 is an frugal number, since it uses more digits than its factorization.

274229221561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1047338 (or 523669 counting only the distinct ones).

The product of its digits is 241920, while the sum is 43.

The spelling of 274229221561 in words is "two hundred seventy-four billion, two hundred twenty-nine million, two hundred twenty-one thousand, five hundred sixty-one".