1251715 has 4 divisors (see below), whose sum is σ = 1502064. Its totient is φ = 1001368.

The previous prime is 1251713. The next prime is 1251721. The reversal of 1251715 is 5171521.

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 1251715 - 2¹ = 1251713 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1251713) 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, 125167 + ... + 125176.

It is an arithmetic number, because the mean of its divisors is an integer number (375516).

2^1251715 is an apocalyptic number.

1251715 is a deficient number, since it is larger than the sum of its proper divisors (250349).

1251715 is an equidigital number, since it uses as much as digits as its factorization.

1251715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250348.

The product of its digits is 350, while the sum is 22.

The square root of 1251715 is about 1118.8006971753. The cubic root of 1251715 is about 107.7709767283.

The spelling of 1251715 in words is "one million, two hundred fifty-one thousand, seven hundred fifteen".