1645281149 has 8 divisors (see below), whose sum is σ = 1720534272. Its totient is φ = 1570338000.

The previous prime is 1645281137. The next prime is 1645281167. The reversal of 1645281149 is 9411825461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1645281149 - 2²⁸ = 1376845693 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645281049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66602 + ... + 87899.

It is an arithmetic number, because the mean of its divisors is an integer number (215066784).

Almost surely, 2^1645281149 is an apocalyptic number.

It is an amenable number.

1645281149 is a deficient number, since it is larger than the sum of its proper divisors (75253123).

1645281149 is a wasteful number, since it uses less digits than its factorization.

1645281149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154987.

The product of its digits is 69120, while the sum is 41.

The square root of 1645281149 is about 40562.0653936655. The cubic root of 1645281149 is about 1180.5381890960.

The spelling of 1645281149 in words is "one billion, six hundred forty-five million, two hundred eighty-one thousand, one hundred forty-nine".