19457181121 has 9 divisors (see below), whose sum is σ = 22634999649. Its totient is φ = 16676746884.

The previous prime is 19457181043. The next prime is 19457181143. The reversal of 19457181121 is 12118175491.

The square root of 19457181121 is 139489.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 19457181121 - 2¹¹ = 19457179073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19457181151) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 966460 + ... + 986386.

It is an arithmetic number, because the mean of its divisors is an integer number (2514999961).

Almost surely, 2^19457181121 is an apocalyptic number.

19457181121 is the 139489-th square number.

19457181121 is the 69745-th centered octagonal number.

It is an amenable number.

19457181121 is a deficient number, since it is larger than the sum of its proper divisors (3177818528).

19457181121 is an frugal number, since it uses more digits than its factorization.

19457181121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39868 (or 19934 counting only the distinct ones).

The product of its digits is 20160, while the sum is 40.

The spelling of 19457181121 in words is "nineteen billion, four hundred fifty-seven million, one hundred eighty-one thousand, one hundred twenty-one".