9955533391 has 2 divisors, whose sum is σ = 9955533392. Its totient is φ = 9955533390.

The previous prime is 9955533383. The next prime is 9955533397. The reversal of 9955533391 is 1933355599.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9955533391 - 2³ = 9955533383 is a prime.

It is a super-2 number, since 2×9955533391² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9955533397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4977766695 + 4977766696.

It is an arithmetic number, because the mean of its divisors is an integer number (4977766696).

Almost surely, 2^9955533391 is an apocalyptic number.

9955533391 is a deficient number, since it is larger than the sum of its proper divisors (1).

9955533391 is an equidigital number, since it uses as much as digits as its factorization.

9955533391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2460375, while the sum is 52.

The square root of 9955533391 is about 99777.4192440354. The cubic root of 9955533391 is about 2151.2365982282.

The spelling of 9955533391 in words is "nine billion, nine hundred fifty-five million, five hundred thirty-three thousand, three hundred ninety-one".