1251321 has 16 divisors (see below), whose sum is σ = 1819200. Its totient is φ = 762048.

The previous prime is 1251317. The next prime is 1251323. The reversal of 1251321 is 1231521.

It is not a de Polignac number, because 1251321 - 2² = 1251317 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1251321.

It is not an unprimeable number, because it can be changed into a prime (1251323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1275 + ... + 2031.

It is an arithmetic number, because the mean of its divisors is an integer number (113700).

2^1251321 is an apocalyptic number.

It is an amenable number.

1251321 is a deficient number, since it is larger than the sum of its proper divisors (567879).

1251321 is a wasteful number, since it uses less digits than its factorization.

1251321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 808.

The product of its digits is 60, while the sum is 15.

The square root of 1251321 is about 1118.6246019108. The cubic root of 1251321 is about 107.7596679184.

Adding to 1251321 its reverse (1231521), we get a palindrome (2482842).

The spelling of 1251321 in words is "one million, two hundred fifty-one thousand, three hundred twenty-one".