1251345 has 8 divisors (see below), whose sum is σ = 2002176. Its totient is φ = 667376.

The previous prime is 1251329. The next prime is 1251409. The reversal of 1251345 is 5431521.

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

It is a cyclic number.

It is not a de Polignac number, because 1251345 - 2⁴ = 1251329 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41697 + ... + 41726.

It is an arithmetic number, because the mean of its divisors is an integer number (250272).

2^1251345 is an apocalyptic number.

1251345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1251345 is a deficient number, since it is larger than the sum of its proper divisors (750831).

1251345 is an equidigital number, since it uses as much as digits as its factorization.

1251345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83431.

The product of its digits is 600, while the sum is 21.

The square root of 1251345 is about 1118.6353293187. The cubic root of 1251345 is about 107.7603568478.

Adding to 1251345 its reverse (5431521), we get a palindrome (6682866).

It can be divided in two parts, 1251 and 345, that added together give a triangular number (1596 = T₅₆).

The spelling of 1251345 in words is "one million, two hundred fifty-one thousand, three hundred forty-five".