1361509644 has 24 divisors (see below), whose sum is σ = 3465661248. Its totient is φ = 412578640.

The previous prime is 1361509631. The next prime is 1361509649. The reversal of 1361509644 is 4469051631.

It is not an unprimeable number, because it can be changed into a prime (1361509649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5157102 + ... + 5157365.

It is an arithmetic number, because the mean of its divisors is an integer number (144402552).

Almost surely, 2^1361509644 is an apocalyptic number.

It is an amenable number.

1361509644 is an abundant number, since it is smaller than the sum of its proper divisors (2104151604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1361509644 is a wasteful number, since it uses less digits than its factorization.

1361509644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10314485 (or 10314483 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 1361509644 is about 36898.6401375444. The cubic root of 1361509644 is about 1108.3414464190.

The spelling of 1361509644 in words is "one billion, three hundred sixty-one million, five hundred nine thousand, six hundred forty-four".