1231321451 has 2 divisors, whose sum is σ = 1231321452. Its totient is φ = 1231321450.

The previous prime is 1231321381. The next prime is 1231321459. The reversal of 1231321451 is 1541231321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1231321451 - 2¹⁰ = 1231320427 is a prime.

It is a nialpdrome in base 14.

It is not a weakly prime, because it can be changed into another prime (1231321459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615660725 + 615660726.

It is an arithmetic number, because the mean of its divisors is an integer number (615660726).

Almost surely, 2^1231321451 is an apocalyptic number.

1231321451 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231321451 is an equidigital number, since it uses as much as digits as its factorization.

1231321451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 23.

The square root of 1231321451 is about 35090.1902388688. The cubic root of 1231321451 is about 1071.8248334841.

Adding to 1231321451 its reverse (1541231321), we get a palindrome (2772552772).

The spelling of 1231321451 in words is "one billion, two hundred thirty-one million, three hundred twenty-one thousand, four hundred fifty-one".