197134391 has 2 divisors, whose sum is σ = 197134392. Its totient is φ = 197134390.

The previous prime is 197134351. The next prime is 197134393. The reversal of 197134391 is 193431791.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 197134391 - 2²⁶ = 130025527 is a prime.

It is a super-2 number, since 2×197134391² = 77723936229881762, which contains 22 as substring.

Together with 197134393, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197134393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98567195 + 98567196.

It is an arithmetic number, because the mean of its divisors is an integer number (98567196).

Almost surely, 2^197134391 is an apocalyptic number.

197134391 is a deficient number, since it is larger than the sum of its proper divisors (1).

197134391 is an equidigital number, since it uses as much as digits as its factorization.

197134391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20412, while the sum is 38.

The square root of 197134391 is about 14040.4555125537. The cubic root of 197134391 is about 581.9970703631.

The spelling of 197134391 in words is "one hundred ninety-seven million, one hundred thirty-four thousand, three hundred ninety-one".