1311023002 has 4 divisors (see below), whose sum is σ = 1966534506. Its totient is φ = 655511500.

The previous prime is 1311022963. The next prime is 1311023003. The reversal of 1311023002 is 2003201131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2003201131 = 251 ⋅7980881.

It can be written as a sum of positive squares in only one way, i.e., 808321761 + 502701241 = 28431^2 + 22421^2 .

It is not an unprimeable number, because it can be changed into a prime (1311023003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327755749 + ... + 327755752.

Almost surely, 2^1311023002 is an apocalyptic number.

1311023002 is a deficient number, since it is larger than the sum of its proper divisors (655511504).

1311023002 is an equidigital number, since it uses as much as digits as its factorization.

1311023002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655511503.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 1311023002 is about 36208.0516183901. The cubic root of 1311023002 is about 1094.4689298007.

Adding to 1311023002 its reverse (2003201131), we get a palindrome (3314224133).

The spelling of 1311023002 in words is "one billion, three hundred eleven million, twenty-three thousand, two".