197149691 has 2 divisors, whose sum is σ = 197149692. Its totient is φ = 197149690.

The previous prime is 197149661. The next prime is 197149699. The reversal of 197149691 is 196941791.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 197149691 - 2¹⁸ = 196887547 is a prime.

It is a super-2 number, since 2×197149691² = 77736001322790962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (197149699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98574845 + 98574846.

It is an arithmetic number, because the mean of its divisors is an integer number (98574846).

Almost surely, 2^197149691 is an apocalyptic number.

197149691 is a deficient number, since it is larger than the sum of its proper divisors (1).

197149691 is an equidigital number, since it uses as much as digits as its factorization.

197149691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 47.

The square root of 197149691 is about 14041.0003561000. Note that the first 3 decimals coincide. The cubic root of 197149691 is about 582.0121266314.

The spelling of 197149691 in words is "one hundred ninety-seven million, one hundred forty-nine thousand, six hundred ninety-one".