19451893941 has 6 divisors (see below), whose sum is σ = 28097180150. Its totient is φ = 12967929288.

The previous prime is 19451893939. The next prime is 19451893963. The reversal of 19451893941 is 14939815491.

It is a happy number.

19451893941 is a `hidden beast` number, since 1 + 94 + 518 + 9 + 39 + 4 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16723921041 + 2727972900 = 129321^2 + 52230^2 .

It is not a de Polignac number, because 19451893941 - 2¹ = 19451893939 is a prime.

It is a super-2 number, since 2×19451893941² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19451893921) 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 5 ways as a sum of consecutive naturals, for example, 1080660766 + ... + 1080660783.

Almost surely, 2^19451893941 is an apocalyptic number.

It is an amenable number.

19451893941 is a deficient number, since it is larger than the sum of its proper divisors (8645286209).

19451893941 is a wasteful number, since it uses less digits than its factorization.

19451893941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2161321555 (or 2161321552 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 54.

The spelling of 19451893941 in words is "nineteen billion, four hundred fifty-one million, eight hundred ninety-three thousand, nine hundred forty-one".