187222213 has 2 divisors, whose sum is σ = 187222214. Its totient is φ = 187222212.

The previous prime is 187222201. The next prime is 187222223. The reversal of 187222213 is 312222781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 186677569 + 544644 = 13663^2 + 738^2 .

It is a cyclic number.

It is not a de Polignac number, because 187222213 - 2¹⁷ = 187091141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (187222223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93611106 + 93611107.

It is an arithmetic number, because the mean of its divisors is an integer number (93611107).

Almost surely, 2^187222213 is an apocalyptic number.

It is an amenable number.

187222213 is a deficient number, since it is larger than the sum of its proper divisors (1).

187222213 is an equidigital number, since it uses as much as digits as its factorization.

187222213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688, while the sum is 28.

The square root of 187222213 is about 13682.9168308515. The cubic root of 187222213 is about 572.0743266986.

Adding to 187222213 its reverse (312222781), we get a palindrome (499444994).

The spelling of 187222213 in words is "one hundred eighty-seven million, two hundred twenty-two thousand, two hundred thirteen".