131115311 has 4 divisors (see below), whose sum is σ = 131194272. Its totient is φ = 131036352.

The previous prime is 131115307. The next prime is 131115319. The reversal of 131115311 is 113511131.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 131115311 - 2² = 131115307 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131115311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131115319) 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, 36935 + ... + 40328.

It is an arithmetic number, because the mean of its divisors is an integer number (32798568).

Almost surely, 2^131115311 is an apocalyptic number.

131115311 is a deficient number, since it is larger than the sum of its proper divisors (78961).

131115311 is an equidigital number, since it uses as much as digits as its factorization.

131115311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78960.

The product of its digits is 45, while the sum is 17.

The square root of 131115311 is about 11450.5594186485. The cubic root of 131115311 is about 508.0242809297.

Adding to 131115311 its reverse (113511131), we get a palindrome (244626442).

The spelling of 131115311 in words is "one hundred thirty-one million, one hundred fifteen thousand, three hundred eleven".