187500081 has 8 divisors (see below), whose sum is σ = 255814240. Its totient is φ = 122092992.

The previous prime is 187500029. The next prime is 187500097. The reversal of 187500081 is 180005781.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-187500081 is a prime.

It is a super-2 number, since 2×187500081² = 70312560750013122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (187500881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 726616 + ... + 726873.

It is an arithmetic number, because the mean of its divisors is an integer number (31976780).

Almost surely, 2^187500081 is an apocalyptic number.

It is an amenable number.

187500081 is a deficient number, since it is larger than the sum of its proper divisors (68314159).

187500081 is a wasteful number, since it uses less digits than its factorization.

187500081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1453535.

The product of its (nonzero) digits is 2240, while the sum is 30.

The square root of 187500081 is about 13693.0668953306. The cubic root of 187500081 is about 572.3572036961.

The spelling of 187500081 in words is "one hundred eighty-seven million, five hundred thousand, eighty-one".