1312213450 has 24 divisors (see below), whose sum is σ = 2446054380. Its totient is φ = 523737600.

The previous prime is 1312213447. The next prime is 1312213451. The reversal of 1312213450 is 543122131.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 56715961 + 1255497489 = 7531^2 + 35433^2 .

It is not an unprimeable number, because it can be changed into a prime (1312213451) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5415 + ... + 51514.

Almost surely, 2^1312213450 is an apocalyptic number.

1312213450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1312213450 is a deficient number, since it is larger than the sum of its proper divisors (1133840930).

1312213450 is a wasteful number, since it uses less digits than its factorization.

1312213450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57402 (or 57397 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1312213450 is about 36224.4868838746. The cubic root of 1312213450 is about 1094.8000997308.

Adding to 1312213450 its reverse (543122131), we get a palindrome (1855335581).

The spelling of 1312213450 in words is "one billion, three hundred twelve million, two hundred thirteen thousand, four hundred fifty".