187920149 has 2 divisors, whose sum is σ = 187920150. Its totient is φ = 187920148.

The previous prime is 187920121. The next prime is 187920163. The reversal of 187920149 is 941029781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 184144900 + 3775249 = 13570^2 + 1943^2 .

It is a cyclic number.

It is not a de Polignac number, because 187920149 - 2¹⁶ = 187854613 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (187920119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93960074 + 93960075.

It is an arithmetic number, because the mean of its divisors is an integer number (93960075).

Almost surely, 2^187920149 is an apocalyptic number.

It is an amenable number.

187920149 is a deficient number, since it is larger than the sum of its proper divisors (1).

187920149 is an equidigital number, since it uses as much as digits as its factorization.

187920149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 187920149 is about 13708.3970251813. The cubic root of 187920149 is about 572.7843139466.

The spelling of 187920149 in words is "one hundred eighty-seven million, nine hundred twenty thousand, one hundred forty-nine".