1231321351 has 16 divisors (see below), whose sum is σ = 1346002560. Its totient is φ = 1119575520.

The previous prime is 1231321313. The next prime is 1231321361. The reversal of 1231321351 is 1531231321.

It is a cyclic number.

It is not a de Polignac number, because 1231321351 - 2¹⁹ = 1230797063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231321361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 407436 + ... + 410446.

It is an arithmetic number, because the mean of its divisors is an integer number (84125160).

Almost surely, 2^1231321351 is an apocalyptic number.

1231321351 is a deficient number, since it is larger than the sum of its proper divisors (114681209).

1231321351 is a wasteful number, since it uses less digits than its factorization.

1231321351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3486.

The product of its digits is 540, while the sum is 22.

The square root of 1231321351 is about 35090.1888139691. The cubic root of 1231321351 is about 1071.8248044686.

Adding to 1231321351 its reverse (1531231321), we get a palindrome (2762552672).

The spelling of 1231321351 in words is "one billion, two hundred thirty-one million, three hundred twenty-one thousand, three hundred fifty-one".