1361604691 has 4 divisors (see below), whose sum is σ = 1363263984. Its totient is φ = 1359945400.

The previous prime is 1361604683. The next prime is 1361604697. The reversal of 1361604691 is 1964061631.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1361604691 - 2³ = 1361604683 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1361604691.

It is not an unprimeable number, because it can be changed into a prime (1361604697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 828415 + ... + 830056.

It is an arithmetic number, because the mean of its divisors is an integer number (340815996).

Almost surely, 2^1361604691 is an apocalyptic number.

1361604691 is a deficient number, since it is larger than the sum of its proper divisors (1659293).

1361604691 is an equidigital number, since it uses as much as digits as its factorization.

1361604691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1659292.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 1361604691 is about 36899.9280622605. The cubic root of 1361604691 is about 1108.3672369275.

The spelling of 1361604691 in words is "one billion, three hundred sixty-one million, six hundred four thousand, six hundred ninety-one".