1645311129 has 16 divisors (see below), whose sum is σ = 2735063040. Its totient is φ = 854706960.

The previous prime is 1645311127. The next prime is 1645311131. The reversal of 1645311129 is 9211135461.

It is an interprime number because it is at equal distance from previous prime (1645311127) and next prime (1645311131).

It is not a de Polignac number, because 1645311129 - 2¹ = 1645311127 is a prime.

It is a super-2 number, since 2×1645311129² = 5414097422422509282, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a self number, because there is not a number n which added to its sum of digits gives 1645311129.

It is not an unprimeable number, because it can be changed into a prime (1645311121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3561049 + ... + 3561510.

It is an arithmetic number, because the mean of its divisors is an integer number (170941440).

Almost surely, 2^1645311129 is an apocalyptic number.

It is an amenable number.

1645311129 is a deficient number, since it is larger than the sum of its proper divisors (1089751911).

1645311129 is a wasteful number, since it uses less digits than its factorization.

1645311129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7122580.

The product of its digits is 6480, while the sum is 33.

The square root of 1645311129 is about 40562.4349491004. The cubic root of 1645311129 is about 1180.5453595666.

The spelling of 1645311129 in words is "one billion, six hundred forty-five million, three hundred eleven thousand, one hundred twenty-nine".