1881169945 has 16 divisors (see below), whose sum is σ = 2282427072. Its totient is φ = 1488289600.

The previous prime is 1881169943. The next prime is 1881169957. The reversal of 1881169945 is 5499611881.

It is not a de Polignac number, because 1881169945 - 2¹ = 1881169943 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1881169892 and 1881169901.

It is not an unprimeable number, because it can be changed into a prime (1881169943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 585714 + ... + 588916.

It is an arithmetic number, because the mean of its divisors is an integer number (142651692).

Almost surely, 2^1881169945 is an apocalyptic number.

It is an amenable number.

1881169945 is a deficient number, since it is larger than the sum of its proper divisors (401257127).

1881169945 is a wasteful number, since it uses less digits than its factorization.

1881169945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4472.

The product of its digits is 622080, while the sum is 52.

The square root of 1881169945 is about 43372.4560637278. The cubic root of 1881169945 is about 1234.4571245216.

The spelling of 1881169945 in words is "one billion, eight hundred eighty-one million, one hundred sixty-nine thousand, nine hundred forty-five".