187261121 has 4 divisors (see below), whose sum is σ = 187418244. Its totient is φ = 187104000.

The previous prime is 187261117. The next prime is 187261159. The reversal of 187261121 is 121162781.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26884225 + 160376896 = 5185^2 + 12664^2 .

It is a cyclic number.

It is not a de Polignac number, because 187261121 - 2² = 187261117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (187261721) 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, 76760 + ... + 79161.

It is an arithmetic number, because the mean of its divisors is an integer number (46854561).

Almost surely, 2^187261121 is an apocalyptic number.

It is an amenable number.

187261121 is a deficient number, since it is larger than the sum of its proper divisors (157123).

187261121 is a wasteful number, since it uses less digits than its factorization.

187261121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157122.

The product of its digits is 1344, while the sum is 29.

The square root of 187261121 is about 13684.3385298669. The cubic root of 187261121 is about 572.1139529193.

The spelling of 187261121 in words is "one hundred eighty-seven million, two hundred sixty-one thousand, one hundred twenty-one".