1245312321 has 8 divisors (see below), whose sum is σ = 1811363424. Its totient is φ = 754734720.

The previous prime is 1245312283. The next prime is 1245312323. The reversal of 1245312321 is 1232135421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1245312321 - 2¹⁰ = 1245311297 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1245312291 and 1245312300.

It is not an unprimeable number, because it can be changed into a prime (1245312323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18868336 + ... + 18868401.

It is an arithmetic number, because the mean of its divisors is an integer number (226420428).

Almost surely, 2^1245312321 is an apocalyptic number.

1245312321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1245312321 is a deficient number, since it is larger than the sum of its proper divisors (566051103).

1245312321 is a wasteful number, since it uses less digits than its factorization.

1245312321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37736751.

The product of its digits is 1440, while the sum is 24.

The square root of 1245312321 is about 35288.9829975305. The cubic root of 1245312321 is about 1075.8690851191.

Adding to 1245312321 its reverse (1232135421), we get a palindrome (2477447742).

Subtracting from 1245312321 its reverse (1232135421), we obtain a square (13176900 = 3630²).

The spelling of 1245312321 in words is "one billion, two hundred forty-five million, three hundred twelve thousand, three hundred twenty-one".