1145309491 has 4 divisors (see below), whose sum is σ = 1150445632. Its totient is φ = 1140173352.

The previous prime is 1145309471. The next prime is 1145309497. The reversal of 1145309491 is 1949035411.

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 1145309491 - 2¹³ = 1145301299 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 1145309491.

It is not an unprimeable number, because it can be changed into a prime (1145309497) 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, 2567736 + ... + 2568181.

It is an arithmetic number, because the mean of its divisors is an integer number (287611408).

Almost surely, 2^1145309491 is an apocalyptic number.

1145309491 is a deficient number, since it is larger than the sum of its proper divisors (5136141).

1145309491 is an equidigital number, since it uses as much as digits as its factorization.

1145309491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5136140.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 1145309491 is about 33842.4214706927. The cubic root of 1145309491 is about 1046.2632071881.

The spelling of 1145309491 in words is "one billion, one hundred forty-five million, three hundred nine thousand, four hundred ninety-one".