81250003 has 4 divisors (see below), whose sum is σ = 81462528. Its totient is φ = 81037480.

The previous prime is 81249997. The next prime is 81250019. The reversal of 81250003 is 30005218.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81250003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81250033) 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, 105688 + ... + 106453.

It is an arithmetic number, because the mean of its divisors is an integer number (20365632).

Almost surely, 2^81250003 is an apocalyptic number.

81250003 is a deficient number, since it is larger than the sum of its proper divisors (212525).

81250003 is a wasteful number, since it uses less digits than its factorization.

81250003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212524.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 81250003 is about 9013.8783550700. The cubic root of 81250003 is about 433.1195580012.

The spelling of 81250003 in words is "eighty-one million, two hundred fifty thousand, three".