1311133402 has 4 divisors (see below), whose sum is σ = 1966700106. Its totient is φ = 655566700.

The previous prime is 1311133387. The next prime is 1311133433. The reversal of 1311133402 is 2043311131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2043311131 = 173 ⋅11811047.

It can be written as a sum of positive squares in only one way, i.e., 937523161 + 373610241 = 30619^2 + 19329^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1311133402.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327783349 + ... + 327783352.

Almost surely, 2^1311133402 is an apocalyptic number.

1311133402 is a deficient number, since it is larger than the sum of its proper divisors (655566704).

1311133402 is an equidigital number, since it uses as much as digits as its factorization.

1311133402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655566703.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 1311133402 is about 36209.5761090903. The cubic root of 1311133402 is about 1094.4996503343.

Adding to 1311133402 its reverse (2043311131), we get a palindrome (3354444533).

The spelling of 1311133402 in words is "one billion, three hundred eleven million, one hundred thirty-three thousand, four hundred two".