9551981493 has 24 divisors (see below), whose sum is σ = 13885560000. Its totient is φ = 6327345024.

The previous prime is 9551981477. The next prime is 9551981501. The reversal of 9551981493 is 3941891559.

9551981493 is a `hidden beast` number, since 9 + 5 + 519 + 81 + 49 + 3 = 666.

It is not a de Polignac number, because 9551981493 - 2⁴ = 9551981477 is a prime.

It is a super-2 number, since 2×9551981493² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9551981393) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1477933 + ... + 1484381.

It is an arithmetic number, because the mean of its divisors is an integer number (578565000).

Almost surely, 2^9551981493 is an apocalyptic number.

It is an amenable number.

9551981493 is a deficient number, since it is larger than the sum of its proper divisors (4333578507).

9551981493 is a wasteful number, since it uses less digits than its factorization.

9551981493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7481 (or 7478 counting only the distinct ones).

The product of its digits is 1749600, while the sum is 54.

The square root of 9551981493 is about 97734.2391027832. The cubic root of 9551981493 is about 2121.7676527119.

The spelling of 9551981493 in words is "nine billion, five hundred fifty-one million, nine hundred eighty-one thousand, four hundred ninety-three".