197015687191 has 2 divisors, whose sum is σ = 197015687192. Its totient is φ = 197015687190.

The previous prime is 197015687161. The next prime is 197015687203. The reversal of 197015687191 is 191786510791.

It is a strong prime.

It is an emirp because it is prime and its reverse (191786510791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 197015687191 - 2¹³ = 197015678999 is a prime.

It is a super-2 number, since 2×197015687191² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197015687131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98507843595 + 98507843596.

It is an arithmetic number, because the mean of its divisors is an integer number (98507843596).

Almost surely, 2^197015687191 is an apocalyptic number.

197015687191 is a deficient number, since it is larger than the sum of its proper divisors (1).

197015687191 is an equidigital number, since it uses as much as digits as its factorization.

197015687191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 952560, while the sum is 55.

The spelling of 197015687191 in words is "one hundred ninety-seven billion, fifteen million, six hundred eighty-seven thousand, one hundred ninety-one".