1361743609 has 2 divisors, whose sum is σ = 1361743610. Its totient is φ = 1361743608.

The previous prime is 1361743573. The next prime is 1361743613. The reversal of 1361743609 is 9063471631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1251178384 + 110565225 = 35372^2 + 10515^2 .

It is a cyclic number.

It is not a de Polignac number, because 1361743609 - 2²³ = 1353355001 is a prime.

It is not a weakly prime, because it can be changed into another prime (1361743109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 680871804 + 680871805.

It is an arithmetic number, because the mean of its divisors is an integer number (680871805).

Almost surely, 2^1361743609 is an apocalyptic number.

It is an amenable number.

1361743609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1361743609 is an equidigital number, since it uses as much as digits as its factorization.

1361743609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 1361743609 is about 36901.8103756442. The cubic root of 1361743609 is about 1108.4049294444.

The spelling of 1361743609 in words is "one billion, three hundred sixty-one million, seven hundred forty-three thousand, six hundred nine".