191556732013 has 2 divisors, whose sum is σ = 191556732014. Its totient is φ = 191556732012.

The previous prime is 191556731929. The next prime is 191556732067. The reversal of 191556732013 is 310237655191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 168623567044 + 22933164969 = 410638^2 + 151437^2 .

It is a cyclic number.

It is not a de Polignac number, because 191556732013 - 2³³ = 182966797421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191556732083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95778366006 + 95778366007.

It is an arithmetic number, because the mean of its divisors is an integer number (95778366007).

Almost surely, 2^191556732013 is an apocalyptic number.

It is an amenable number.

191556732013 is a deficient number, since it is larger than the sum of its proper divisors (1).

191556732013 is an equidigital number, since it uses as much as digits as its factorization.

191556732013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 170100, while the sum is 43.

The spelling of 191556732013 in words is "one hundred ninety-one billion, five hundred fifty-six million, seven hundred thirty-two thousand, thirteen".