30891108869 has 2 divisors, whose sum is σ = 30891108870. Its totient is φ = 30891108868.

The previous prime is 30891108841. The next prime is 30891108917. The reversal of 30891108869 is 96880119803.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28006022500 + 2885086369 = 167350^2 + 53713^2 .

It is a cyclic number.

It is not a de Polignac number, because 30891108869 - 2¹⁶ = 30891043333 is a prime.

It is a super-2 number, since 2×30891108869² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 30891108869.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30891108169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15445554434 + 15445554435.

It is an arithmetic number, because the mean of its divisors is an integer number (15445554435).

Almost surely, 2^30891108869 is an apocalyptic number.

It is an amenable number.

30891108869 is a deficient number, since it is larger than the sum of its proper divisors (1).

30891108869 is an equidigital number, since it uses as much as digits as its factorization.

30891108869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 746496, while the sum is 53.

The spelling of 30891108869 in words is "thirty billion, eight hundred ninety-one million, one hundred eight thousand, eight hundred sixty-nine".