191088013 has 2 divisors, whose sum is σ = 191088014. Its totient is φ = 191088012.

The previous prime is 191087993. The next prime is 191088059. The reversal of 191088013 is 310880191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 178142409 + 12945604 = 13347^2 + 3598^2 .

It is a cyclic number.

It is not a de Polignac number, because 191088013 - 2¹³ = 191079821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191088083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95544006 + 95544007.

It is an arithmetic number, because the mean of its divisors is an integer number (95544007).

Almost surely, 2^191088013 is an apocalyptic number.

It is an amenable number.

191088013 is a deficient number, since it is larger than the sum of its proper divisors (1).

191088013 is an equidigital number, since it uses as much as digits as its factorization.

191088013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 31.

The square root of 191088013 is about 13823.4587929360. The cubic root of 191088013 is about 575.9849663723.

The spelling of 191088013 in words is "one hundred ninety-one million, eighty-eight thousand, thirteen".