1345091999 has 4 divisors (see below), whose sum is σ = 1362118560. Its totient is φ = 1328065440.

The previous prime is 1345091983. The next prime is 1345092011. The reversal of 1345091999 is 9991905431.

It is a happy number.

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 1345091999 - 2⁴ = 1345091983 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 (1345091939) 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, 8513162 + ... + 8513319.

It is an arithmetic number, because the mean of its divisors is an integer number (340529640).

Almost surely, 2^1345091999 is an apocalyptic number.

1345091999 is a deficient number, since it is larger than the sum of its proper divisors (17026561).

1345091999 is an equidigital number, since it uses as much as digits as its factorization.

1345091999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17026560.

The product of its (nonzero) digits is 393660, while the sum is 50.

The square root of 1345091999 is about 36675.4958930346. The cubic root of 1345091999 is about 1103.8684728203.

The spelling of 1345091999 in words is "one billion, three hundred forty-five million, ninety-one thousand, nine hundred ninety-nine".