1361864409 has 4 divisors (see below), whose sum is σ = 1815819216. Its totient is φ = 907909604.

The previous prime is 1361864377. The next prime is 1361864411. The reversal of 1361864409 is 9044681631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1361864409 - 2⁵ = 1361864377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1361864479) 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, 226977399 + ... + 226977404.

It is an arithmetic number, because the mean of its divisors is an integer number (453954804).

Almost surely, 2^1361864409 is an apocalyptic number.

It is an amenable number.

1361864409 is a deficient number, since it is larger than the sum of its proper divisors (453954807).

1361864409 is an equidigital number, since it uses as much as digits as its factorization.

1361864409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453954806.

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 1361864409 is about 36903.4471154119. The cubic root of 1361864409 is about 1108.4377039343.

The spelling of 1361864409 in words is "one billion, three hundred sixty-one million, eight hundred sixty-four thousand, four hundred nine".