131121233331511 has 4 divisors (see below), whose sum is σ = 138834247056912. Its totient is φ = 123408219606112.

The previous prime is 131121233331499. The next prime is 131121233331559. The reversal of 131121233331511 is 115133332121131.

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 131121233331511 - 2¹⁹ = 131121232807223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131121233337511) 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, 3856506862675 + ... + 3856506862708.

It is an arithmetic number, because the mean of its divisors is an integer number (34708561764228).

Almost surely, 2^{131121233331511} is an apocalyptic number.

131121233331511 is a deficient number, since it is larger than the sum of its proper divisors (7713013725401).

131121233331511 is an equidigital number, since it uses as much as digits as its factorization.

131121233331511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7713013725400.

The product of its digits is 4860, while the sum is 31.

Adding to 131121233331511 its reverse (115133332121131), we get a palindrome (246254565452642).

The spelling of 131121233331511 in words is "one hundred thirty-one trillion, one hundred twenty-one billion, two hundred thirty-three million, three hundred thirty-one thousand, five hundred eleven".