189991370287 has 2 divisors, whose sum is σ = 189991370288. Its totient is φ = 189991370286.

The previous prime is 189991370273. The next prime is 189991370329. The reversal of 189991370287 is 782073199981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 189991370287 - 2⁷ = 189991370159 is a prime.

It is a super-3 number, since 3×189991370287³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189991379287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94995685143 + 94995685144.

It is an arithmetic number, because the mean of its divisors is an integer number (94995685144).

Almost surely, 2^189991370287 is an apocalyptic number.

189991370287 is a deficient number, since it is larger than the sum of its proper divisors (1).

189991370287 is an equidigital number, since it uses as much as digits as its factorization.

189991370287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13716864, while the sum is 64.

The spelling of 189991370287 in words is "one hundred eighty-nine billion, nine hundred ninety-one million, three hundred seventy thousand, two hundred eighty-seven".