187980961 has 4 divisors (see below), whose sum is σ = 214835392. Its totient is φ = 161126532.

The previous prime is 187980953. The next prime is 187980971. The reversal of 187980961 is 169089781.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 187980961 - 2³ = 187980953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (187980901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13427205 + ... + 13427218.

It is an arithmetic number, because the mean of its divisors is an integer number (53708848).

Almost surely, 2^187980961 is an apocalyptic number.

It is an amenable number.

187980961 is a deficient number, since it is larger than the sum of its proper divisors (26854431).

187980961 is an equidigital number, since it uses as much as digits as its factorization.

187980961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26854430.

The product of its (nonzero) digits is 217728, while the sum is 49.

The square root of 187980961 is about 13710.6149023302. The cubic root of 187980961 is about 572.8460926742.

The spelling of 187980961 in words is "one hundred eighty-seven million, nine hundred eighty thousand, nine hundred sixty-one".