1361487221 has 2 divisors, whose sum is σ = 1361487222. Its totient is φ = 1361487220.

The previous prime is 1361487217. The next prime is 1361487223. The reversal of 1361487221 is 1227841631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1360798321 + 688900 = 36889^2 + 830^2 .

It is an emirp because it is prime and its reverse (1227841631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1361487221 - 2² = 1361487217 is a prime.

Together with 1361487223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1361487223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 680743610 + 680743611.

It is an arithmetic number, because the mean of its divisors is an integer number (680743611).

Almost surely, 2^1361487221 is an apocalyptic number.

It is an amenable number.

1361487221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1361487221 is an equidigital number, since it uses as much as digits as its factorization.

1361487221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 35.

The square root of 1361487221 is about 36898.3362904075. The cubic root of 1361487221 is about 1108.3353618797.

The spelling of 1361487221 in words is "one billion, three hundred sixty-one million, four hundred eighty-seven thousand, two hundred twenty-one".