197891417 has 2 divisors, whose sum is σ = 197891418. Its totient is φ = 197891416.

The previous prime is 197891303. The next prime is 197891437. The reversal of 197891417 is 714198791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 169546441 + 28344976 = 13021^2 + 5324^2 .

It is a cyclic number.

It is not a de Polignac number, because 197891417 - 2¹⁸ = 197629273 is a prime.

It is a super-2 number, since 2×197891417² = 78322025844535778, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (197891437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98945708 + 98945709.

It is an arithmetic number, because the mean of its divisors is an integer number (98945709).

Almost surely, 2^197891417 is an apocalyptic number.

It is an amenable number.

197891417 is a deficient number, since it is larger than the sum of its proper divisors (1).

197891417 is an equidigital number, since it uses as much as digits as its factorization.

197891417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 47.

The square root of 197891417 is about 14067.3884214519. The cubic root of 197891417 is about 582.7411044854.

The spelling of 197891417 in words is "one hundred ninety-seven million, eight hundred ninety-one thousand, four hundred seventeen".