1145887997 has 4 divisors (see below), whose sum is σ = 1146310620. Its totient is φ = 1145465376.

The previous prime is 1145887987. The next prime is 1145888017. The reversal of 1145887997 is 7997885411.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 966836836 + 179051161 = 31094^2 + 13381^2 .

It is a cyclic number.

It is not a de Polignac number, because 1145887997 - 2¹⁸ = 1145625853 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 (1145887987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207218 + ... + 212675.

It is an arithmetic number, because the mean of its divisors is an integer number (286577655).

Almost surely, 2^1145887997 is an apocalyptic number.

It is an amenable number.

1145887997 is a deficient number, since it is larger than the sum of its proper divisors (422623).

1145887997 is an equidigital number, since it uses as much as digits as its factorization.

1145887997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422622.

The product of its digits is 5080320, while the sum is 59.

The square root of 1145887997 is about 33850.9674455546. The cubic root of 1145887997 is about 1046.4393364839.

The spelling of 1145887997 in words is "one billion, one hundred forty-five million, eight hundred eighty-seven thousand, nine hundred ninety-seven".