197112991 has 2 divisors, whose sum is σ = 197112992. Its totient is φ = 197112990.

The previous prime is 197112917. The next prime is 197113031. The reversal of 197112991 is 199211791.

It is an a-pointer prime, because the next prime (197113031) can be obtained adding 197112991 to its sum of digits (40).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 197112991 - 2⁷ = 197112863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197112901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98556495 + 98556496.

It is an arithmetic number, because the mean of its divisors is an integer number (98556496).

Almost surely, 2^197112991 is an apocalyptic number.

197112991 is a deficient number, since it is larger than the sum of its proper divisors (1).

197112991 is an equidigital number, since it uses as much as digits as its factorization.

197112991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10206, while the sum is 40.

The square root of 197112991 is about 14039.6934083334. The cubic root of 197112991 is about 581.9760099620.

The spelling of 197112991 in words is "one hundred ninety-seven million, one hundred twelve thousand, nine hundred ninety-one".