1355604661 has 2 divisors, whose sum is σ = 1355604662. Its totient is φ = 1355604660.

The previous prime is 1355604629. The next prime is 1355604683. The reversal of 1355604661 is 1664065531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 682202161 + 673402500 = 26119^2 + 25950^2 .

It is an emirp because it is prime and its reverse (1664065531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1355604661 - 2⁵ = 1355604629 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1355604661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1353604661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 677802330 + 677802331.

It is an arithmetic number, because the mean of its divisors is an integer number (677802331).

Almost surely, 2^1355604661 is an apocalyptic number.

It is an amenable number.

1355604661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1355604661 is an equidigital number, since it uses as much as digits as its factorization.

1355604661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 1355604661 is about 36818.5369209587. The cubic root of 1355604661 is about 1106.7368006773.

The spelling of 1355604661 in words is "one billion, three hundred fifty-five million, six hundred four thousand, six hundred sixty-one".