191928202087 has 2 divisors, whose sum is σ = 191928202088. Its totient is φ = 191928202086.

The previous prime is 191928201967. The next prime is 191928202121. The reversal of 191928202087 is 780202829191.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 191928202087 - 2¹¹ = 191928200039 is a prime.

It is a super-2 number, since 2×191928202087² (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 191928202087.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191928202987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95964101043 + 95964101044.

It is an arithmetic number, because the mean of its divisors is an integer number (95964101044).

Almost surely, 2^191928202087 is an apocalyptic number.

191928202087 is a deficient number, since it is larger than the sum of its proper divisors (1).

191928202087 is an equidigital number, since it uses as much as digits as its factorization.

191928202087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 49.

The spelling of 191928202087 in words is "one hundred ninety-one billion, nine hundred twenty-eight million, two hundred two thousand, eighty-seven".