197145887 has 2 divisors, whose sum is σ = 197145888. Its totient is φ = 197145886.

The previous prime is 197145859. The next prime is 197145931. The reversal of 197145887 is 788541791.

197145887 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 197145887 - 2⁸ = 197145631 is a prime.

It is a super-2 number, since 2×197145887² = 77733001522033538, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197145827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98572943 + 98572944.

It is an arithmetic number, because the mean of its divisors is an integer number (98572944).

Almost surely, 2^197145887 is an apocalyptic number.

197145887 is a deficient number, since it is larger than the sum of its proper divisors (1).

197145887 is an equidigital number, since it uses as much as digits as its factorization.

197145887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 564480, while the sum is 50.

The square root of 197145887 is about 14040.8648950127. The cubic root of 197145887 is about 582.0083833025.

The spelling of 197145887 in words is "one hundred ninety-seven million, one hundred forty-five thousand, eight hundred eighty-seven".