8181251 has 8 divisors (see below), whose sum is σ = 8840160. Its totient is φ = 7526592.

The previous prime is 8181221. The next prime is 8181253. The reversal of 8181251 is 1521818.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8181251 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8181251.

It is not an unprimeable number, because it can be changed into a prime (8181253) 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, 3791 + ... + 5543.

It is an arithmetic number, because the mean of its divisors is an integer number (1105020).

Almost surely, 2^8181251 is an apocalyptic number.

8181251 is a deficient number, since it is larger than the sum of its proper divisors (658909).

8181251 is a wasteful number, since it uses less digits than its factorization.

8181251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2125.

The product of its digits is 640, while the sum is 26.

The square root of 8181251 is about 2860.2886218003. The cubic root of 8181251 is about 201.4991595258.

The spelling of 8181251 in words is "eight million, one hundred eighty-one thousand, two hundred fifty-one".