187249913 has 2 divisors, whose sum is σ = 187249914. Its totient is φ = 187249912.

The previous prime is 187249903. The next prime is 187249949. The reversal of 187249913 is 319942781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136726249 + 50523664 = 11693^2 + 7108^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-187249913 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (187249903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93624956 + 93624957.

It is an arithmetic number, because the mean of its divisors is an integer number (93624957).

Almost surely, 2^187249913 is an apocalyptic number.

It is an amenable number.

187249913 is a deficient number, since it is larger than the sum of its proper divisors (1).

187249913 is an equidigital number, since it uses as much as digits as its factorization.

187249913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 44.

The square root of 187249913 is about 13683.9290044928. The cubic root of 187249913 is about 572.1025385885.

The spelling of 187249913 in words is "one hundred eighty-seven million, two hundred forty-nine thousand, nine hundred thirteen".