1145851609 has 4 divisors (see below), whose sum is σ = 1309544704. Its totient is φ = 982158516.

The previous prime is 1145851607. The next prime is 1145851627. The reversal of 1145851609 is 9061585411.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1145851609 - 2¹ = 1145851607 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1145851607) 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, 81846537 + ... + 81846550.

It is an arithmetic number, because the mean of its divisors is an integer number (327386176).

Almost surely, 2^1145851609 is an apocalyptic number.

It is an amenable number.

1145851609 is a deficient number, since it is larger than the sum of its proper divisors (163693095).

1145851609 is an equidigital number, since it uses as much as digits as its factorization.

1145851609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163693094.

The product of its (nonzero) digits is 43200, while the sum is 40.

The square root of 1145851609 is about 33850.4299677271. The cubic root of 1145851609 is about 1046.4282597068.

The spelling of 1145851609 in words is "one billion, one hundred forty-five million, eight hundred fifty-one thousand, six hundred nine".