1361719999 has 4 divisors (see below), whose sum is σ = 1362385336. Its totient is φ = 1361054664.

The previous prime is 1361719973. The next prime is 1361720021. The reversal of 1361719999 is 9999171631.

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 1361719999 - 2⁷ = 1361719871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1361713999) 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, 329589 + ... + 333694.

It is an arithmetic number, because the mean of its divisors is an integer number (340596334).

Almost surely, 2^1361719999 is an apocalyptic number.

1361719999 is a deficient number, since it is larger than the sum of its proper divisors (665337).

1361719999 is an equidigital number, since it uses as much as digits as its factorization.

1361719999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665336.

The product of its digits is 826686, while the sum is 55.

The square root of 1361719999 is about 36901.4904712533. The cubic root of 1361719999 is about 1108.3985235416.

The spelling of 1361719999 in words is "one billion, three hundred sixty-one million, seven hundred nineteen thousand, nine hundred ninety-nine".