187198213 has 2 divisors, whose sum is σ = 187198214. Its totient is φ = 187198212.

The previous prime is 187198189. The next prime is 187198217. The reversal of 187198213 is 312891781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 187197124 + 1089 = 13682^2 + 33^2 .

It is a cyclic number.

It is not a de Polignac number, because 187198213 - 2⁹ = 187197701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (187198217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93599106 + 93599107.

It is an arithmetic number, because the mean of its divisors is an integer number (93599107).

Almost surely, 2^187198213 is an apocalyptic number.

It is an amenable number.

187198213 is a deficient number, since it is larger than the sum of its proper divisors (1).

187198213 is an equidigital number, since it uses as much as digits as its factorization.

187198213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 40.

The square root of 187198213 is about 13682.0397967555. The cubic root of 187198213 is about 572.0498809337.

The spelling of 187198213 in words is "one hundred eighty-seven million, one hundred ninety-eight thousand, two hundred thirteen".