187409961 has 12 divisors (see below), whose sum is σ = 275811588. Its totient is φ = 122582304.

The previous prime is 187409951. The next prime is 187409969. The reversal of 187409961 is 169904781.

It is a happy number.

187409961 is a `hidden beast` number, since 187 + 409 + 9 + 61 = 666.

187409961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 78854400 + 108555561 = 8880^2 + 10419^2 .

It is not a de Polignac number, because 187409961 - 2¹⁵ = 187377193 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (187409969) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 195970 + ... + 196923.

It is an arithmetic number, because the mean of its divisors is an integer number (22984299).

Almost surely, 2^187409961 is an apocalyptic number.

It is an amenable number.

187409961 is a deficient number, since it is larger than the sum of its proper divisors (88401627).

187409961 is a wasteful number, since it uses less digits than its factorization.

187409961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392952 (or 392949 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 187409961 is about 13689.7757834086. The cubic root of 187409961 is about 572.2654897849.

The spelling of 187409961 in words is "one hundred eighty-seven million, four hundred nine thousand, nine hundred sixty-one".