191263933639 has 2 divisors, whose sum is σ = 191263933640. Its totient is φ = 191263933638.

The previous prime is 191263933519. The next prime is 191263933643. The reversal of 191263933639 is 936339362191.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 191263933639 - 2²¹ = 191261836487 is a prime.

It is a super-2 number, since 2×191263933639² (a number of 23 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 191263933639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191263903639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95631966819 + 95631966820.

It is an arithmetic number, because the mean of its divisors is an integer number (95631966820).

Almost surely, 2^191263933639 is an apocalyptic number.

191263933639 is a deficient number, since it is larger than the sum of its proper divisors (1).

191263933639 is an equidigital number, since it uses as much as digits as its factorization.

191263933639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4251528, while the sum is 55.

The spelling of 191263933639 in words is "one hundred ninety-one billion, two hundred sixty-three million, nine hundred thirty-three thousand, six hundred thirty-nine".