187448981 has 4 divisors (see below), whose sum is σ = 188059872. Its totient is φ = 186838092.

The previous prime is 187448929. The next prime is 187449013. The reversal of 187448981 is 189844781.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 187448981 - 2⁶ = 187448917 is a prime.

It is a super-2 number, since 2×187448981² = 70274240955876722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (187438981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 304985 + ... + 305598.

It is an arithmetic number, because the mean of its divisors is an integer number (47014968).

Almost surely, 2^187448981 is an apocalyptic number.

It is an amenable number.

187448981 is a deficient number, since it is larger than the sum of its proper divisors (610891).

187448981 is an equidigital number, since it uses as much as digits as its factorization.

187448981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610890.

The product of its digits is 516096, while the sum is 50.

The square root of 187448981 is about 13691.2008604067. The cubic root of 187448981 is about 572.3052035221.

The spelling of 187448981 in words is "one hundred eighty-seven million, four hundred forty-eight thousand, nine hundred eighty-one".