1312120442 has 4 divisors (see below), whose sum is σ = 1968180666. Its totient is φ = 656060220.

The previous prime is 1312120441. The next prime is 1312120451. The reversal of 1312120442 is 2440212131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 675012361 + 637108081 = 25981^2 + 25241^2 .

It is not an unprimeable number, because it can be changed into a prime (1312120441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328030109 + ... + 328030112.

Almost surely, 2^1312120442 is an apocalyptic number.

1312120442 is a deficient number, since it is larger than the sum of its proper divisors (656060224).

1312120442 is an equidigital number, since it uses as much as digits as its factorization.

1312120442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656060223.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1312120442 is about 36223.2030886282. The cubic root of 1312120442 is about 1094.7742331124.

Adding to 1312120442 its reverse (2440212131), we get a palindrome (3752332573).

The spelling of 1312120442 in words is "one billion, three hundred twelve million, one hundred twenty thousand, four hundred forty-two".