187040681 has 4 divisors (see below), whose sum is σ = 198043092. Its totient is φ = 176038272.

The previous prime is 187040653. The next prime is 187040699. The reversal of 187040681 is 186040781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 186040781 = 13451 ⋅13831.

It can be written as a sum of positive squares in 2 ways, for example, as 60590656 + 126450025 = 7784^2 + 11245^2 .

It is a cyclic number.

It is not a de Polignac number, because 187040681 - 2²⁶ = 119931817 is a prime.

It is a super-2 number, since 2×187040681² = 69968432697887522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (187040611) 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, 5501180 + ... + 5501213.

It is an arithmetic number, because the mean of its divisors is an integer number (49510773).

Almost surely, 2^187040681 is an apocalyptic number.

It is an amenable number.

187040681 is a deficient number, since it is larger than the sum of its proper divisors (11002411).

187040681 is a wasteful number, since it uses less digits than its factorization.

187040681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11002410.

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 187040681 is about 13676.2816949637. The cubic root of 187040681 is about 571.8893711180.

The spelling of 187040681 in words is "one hundred eighty-seven million, forty thousand, six hundred eighty-one".