1251245321 has 4 divisors (see below), whose sum is σ = 1260796944. Its totient is φ = 1241693700.

The previous prime is 1251245293. The next prime is 1251245417. The reversal of 1251245321 is 1235421521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1251245321 - 2¹⁸ = 1250983177 is a prime.

It is a super-2 number, since 2×1251245321² = 3131229706648786082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1251245221) 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, 4775615 + ... + 4775876.

It is an arithmetic number, because the mean of its divisors is an integer number (315199236).

Almost surely, 2^1251245321 is an apocalyptic number.

It is an amenable number.

1251245321 is a deficient number, since it is larger than the sum of its proper divisors (9551623).

1251245321 is an equidigital number, since it uses as much as digits as its factorization.

1251245321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9551622.

The product of its digits is 2400, while the sum is 26.

The square root of 1251245321 is about 35372.9461735943. The cubic root of 1251245321 is about 1077.5749546536.

Adding to 1251245321 its reverse (1235421521), we get a palindrome (2486666842).

The spelling of 1251245321 in words is "one billion, two hundred fifty-one million, two hundred forty-five thousand, three hundred twenty-one".