1945115491 has 16 divisors (see below), whose sum is σ = 2196633600. Its totient is φ = 1706371200.

The previous prime is 1945115483. The next prime is 1945115531.

1945115491 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 1945115491 - 2³ = 1945115483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1945115411) 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 15 ways as a sum of consecutive naturals, for example, 114475 + ... + 130363.

It is an arithmetic number, because the mean of its divisors is an integer number (137289600).

Almost surely, 2^1945115491 is an apocalyptic number.

1945115491 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1945115491 is a deficient number, since it is larger than the sum of its proper divisors (251518109).

1945115491 is a wasteful number, since it uses less digits than its factorization.

1945115491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16290.

The product of its digits is 32400, while the sum is 40.

The square root of 1945115491 is about 44103.4634807744. The cubic root of 1945115491 is about 1248.2889636991.

It can be divided in two parts, 194511 and 5491, that added together give a palindrome (200002).

The spelling of 1945115491 in words is "one billion, nine hundred forty-five million, one hundred fifteen thousand, four hundred ninety-one".