1373727281 has 2 divisors, whose sum is σ = 1373727282. Its totient is φ = 1373727280.

The previous prime is 1373727253. The next prime is 1373727283. The reversal of 1373727281 is 1827273731.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1367890225 + 5837056 = 36985^2 + 2416^2 .

It is a cyclic number.

It is not a de Polignac number, because 1373727281 - 2³⁰ = 299985457 is a prime.

It is a super-2 number, since 2×1373727281² = 3774253285127305922, which contains 22 as substring.

Together with 1373727283, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1373727283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 686863640 + 686863641.

It is an arithmetic number, because the mean of its divisors is an integer number (686863641).

Almost surely, 2^1373727281 is an apocalyptic number.

It is an amenable number.

1373727281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1373727281 is an equidigital number, since it uses as much as digits as its factorization.

1373727281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 98784, while the sum is 41.

The square root of 1373727281 is about 37063.8271229510. The cubic root of 1373727281 is about 1111.6468482564.

The spelling of 1373727281 in words is "one billion, three hundred seventy-three million, seven hundred twenty-seven thousand, two hundred eighty-one".