187500001 has 4 divisors (see below), whose sum is σ = 201923092. Its totient is φ = 173076912.

The previous prime is 187499971. The next prime is 187500007. The reversal of 187500001 is 100005781.

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 19149376 + 168350625 = 4376^2 + 12975^2 .

It is a cyclic number.

It is not a de Polignac number, because 187500001 - 2⁹ = 187499489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (187500007) 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, 7211526 + ... + 7211551.

It is an arithmetic number, because the mean of its divisors is an integer number (50480773).

Almost surely, 2^187500001 is an apocalyptic number.

It is an amenable number.

187500001 is a deficient number, since it is larger than the sum of its proper divisors (14423091).

187500001 is a wasteful number, since it uses less digits than its factorization.

187500001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14423090.

The product of its (nonzero) digits is 280, while the sum is 22.

The square root of 187500001 is about 13693.0639741440. The cubic root of 187500001 is about 572.3571222942.

Adding to 187500001 its reverse (100005781), we get a palindrome (287505782).

The spelling of 187500001 in words is "one hundred eighty-seven million, five hundred thousand, one".