1311520133 has 12 divisors (see below), whose sum is σ = 1664341632. Its totient is φ = 1021963320.

The previous prime is 1311520129. The next prime is 1311520169. The reversal of 1311520133 is 3310251131.

It is not a de Polignac number, because 1311520133 - 2² = 1311520129 is a prime.

It is a super-4 number, since 4×1311520133⁴ (a number of 38 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311520103) 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, 1216085 + ... + 1217162.

It is an arithmetic number, because the mean of its divisors is an integer number (138695136).

Almost surely, 2^1311520133 is an apocalyptic number.

It is an amenable number.

1311520133 is a deficient number, since it is larger than the sum of its proper divisors (352821499).

1311520133 is a wasteful number, since it uses less digits than its factorization.

1311520133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2433272 (or 2433265 counting only the distinct ones).

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 1311520133 is about 36214.9158911076. The cubic root of 1311520133 is about 1094.6072507086.

Adding to 1311520133 its reverse (3310251131), we get a palindrome (4621771264).

The spelling of 1311520133 in words is "one billion, three hundred eleven million, five hundred twenty thousand, one hundred thirty-three".