1311120501 has 4 divisors (see below), whose sum is σ = 1748160672. Its totient is φ = 874080332.

The previous prime is 1311120469. The next prime is 1311120511. The reversal of 1311120501 is 1050211131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1311120501 - 2⁵ = 1311120469 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311120511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218520081 + ... + 218520086.

It is an arithmetic number, because the mean of its divisors is an integer number (437040168).

Almost surely, 2^1311120501 is an apocalyptic number.

It is an amenable number.

1311120501 is a deficient number, since it is larger than the sum of its proper divisors (437040171).

1311120501 is an equidigital number, since it uses as much as digits as its factorization.

1311120501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437040170.

The product of its (nonzero) digits is 30, while the sum is 15.

The square root of 1311120501 is about 36209.3979651692. The cubic root of 1311120501 is about 1094.4960605174.

Adding to 1311120501 its reverse (1050211131), we get a palindrome (2361331632).

The spelling of 1311120501 in words is "one billion, three hundred eleven million, one hundred twenty thousand, five hundred one".