1321250451 has 4 divisors (see below), whose sum is σ = 1761667272. Its totient is φ = 880833632.

The previous prime is 1321250419. The next prime is 1321250467. The reversal of 1321250451 is 1540521231.

It is a happy number.

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 1321250451 - 2⁵ = 1321250419 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1321250851) 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, 220208406 + ... + 220208411.

It is an arithmetic number, because the mean of its divisors is an integer number (440416818).

Almost surely, 2^1321250451 is an apocalyptic number.

1321250451 is a deficient number, since it is larger than the sum of its proper divisors (440416821).

1321250451 is an equidigital number, since it uses as much as digits as its factorization.

1321250451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440416820.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 1321250451 is about 36349.0089410977. The cubic root of 1321250451 is about 1097.3075891366.

Adding to 1321250451 its reverse (1540521231), we get a palindrome (2861771682).

The spelling of 1321250451 in words is "one billion, three hundred twenty-one million, two hundred fifty thousand, four hundred fifty-one".