197817131 has 2 divisors, whose sum is σ = 197817132. Its totient is φ = 197817130.

The previous prime is 197817127. The next prime is 197817161. The reversal of 197817131 is 131718791.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 197817131 - 2² = 197817127 is a prime.

It is a super-2 number, since 2×197817131² = 78263234634142322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (197817101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98908565 + 98908566.

It is an arithmetic number, because the mean of its divisors is an integer number (98908566).

Almost surely, 2^197817131 is an apocalyptic number.

197817131 is a deficient number, since it is larger than the sum of its proper divisors (1).

197817131 is an equidigital number, since it uses as much as digits as its factorization.

197817131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10584, while the sum is 38.

The square root of 197817131 is about 14064.7478114611. The cubic root of 197817131 is about 582.6681774155.

The spelling of 197817131 in words is "one hundred ninety-seven million, eight hundred seventeen thousand, one hundred thirty-one".