274487821 has 2 divisors, whose sum is σ = 274487822. Its totient is φ = 274487820.

The previous prime is 274487803. The next prime is 274487891. The reversal of 274487821 is 128784472.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 262893796 + 11594025 = 16214^2 + 3405^2 .

It is a cyclic number.

It is not a de Polignac number, because 274487821 - 2⁵ = 274487789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (274487891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 137243910 + 137243911.

It is an arithmetic number, because the mean of its divisors is an integer number (137243911).

Almost surely, 2^274487821 is an apocalyptic number.

It is an amenable number.

274487821 is a deficient number, since it is larger than the sum of its proper divisors (1).

274487821 is an equidigital number, since it uses as much as digits as its factorization.

274487821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 200704, while the sum is 43.

The square root of 274487821 is about 16567.6739767536. The cubic root of 274487821 is about 649.8917539666.

The spelling of 274487821 in words is "two hundred seventy-four million, four hundred eighty-seven thousand, eight hundred twenty-one".