81252007 has 4 divisors (see below), whose sum is σ = 81274320. Its totient is φ = 81229696.

The previous prime is 81252001. The next prime is 81252011. The reversal of 81252007 is 70025218.

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

It is a cyclic number.

It is not a de Polignac number, because 81252007 - 2⁷ = 81251879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81252001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4282 + ... + 13447.

It is an arithmetic number, because the mean of its divisors is an integer number (20318580).

Almost surely, 2^81252007 is an apocalyptic number.

81252007 is a deficient number, since it is larger than the sum of its proper divisors (22313).

81252007 is a wasteful number, since it uses less digits than its factorization.

81252007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22312.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 81252007 is about 9013.9895163019. The cubic root of 81252007 is about 433.1231188809.

The spelling of 81252007 in words is "eighty-one million, two hundred fifty-two thousand, seven".