187090961 has 4 divisors (see below), whose sum is σ = 187557924. Its totient is φ = 186624000.

The previous prime is 187090931. The next prime is 187090987. The reversal of 187090961 is 169090781.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 169090781 = 67 ⋅2523743.

It can be written as a sum of positive squares in 2 ways, for example, as 172764736 + 14326225 = 13144^2 + 3785^2 .

It is a cyclic number.

It is not a de Polignac number, because 187090961 - 2¹⁰ = 187089937 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (187090931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 232880 + ... + 233681.

It is an arithmetic number, because the mean of its divisors is an integer number (46889481).

Almost surely, 2^187090961 is an apocalyptic number.

It is an amenable number.

187090961 is a deficient number, since it is larger than the sum of its proper divisors (466963).

187090961 is an equidigital number, since it uses as much as digits as its factorization.

187090961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466962.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 187090961 is about 13678.1197903805. The cubic root of 187090961 is about 571.9406113460.

The spelling of 187090961 in words is "one hundred eighty-seven million, ninety thousand, nine hundred sixty-one".