187501213 has 2 divisors, whose sum is σ = 187501214. Its totient is φ = 187501212.

The previous prime is 187501201. The next prime is 187501219. The reversal of 187501213 is 312105781.

187501213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 126630009 + 60871204 = 11253^2 + 7802^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-187501213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (187501219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93750606 + 93750607.

It is an arithmetic number, because the mean of its divisors is an integer number (93750607).

Almost surely, 2^187501213 is an apocalyptic number.

It is an amenable number.

187501213 is a deficient number, since it is larger than the sum of its proper divisors (1).

187501213 is an equidigital number, since it uses as much as digits as its factorization.

187501213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 28.

The square root of 187501213 is about 13693.1082300550. The cubic root of 187501213 is about 572.3583555303.

Adding to 187501213 its reverse (312105781), we get a palindrome (499606994).

The spelling of 187501213 in words is "one hundred eighty-seven million, five hundred one thousand, two hundred thirteen".