11312020131 has 4 divisors (see below), whose sum is σ = 15082693512. Its totient is φ = 7541346752.

The previous prime is 11312020129. The next prime is 11312020151. The reversal of 11312020131 is 13102021311.

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 11312020131 - 2¹ = 11312020129 is a prime.

It is a super-2 number, since 2×11312020131² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11312020131.

It is not an unprimeable number, because it can be changed into a prime (11312020151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1885336686 + ... + 1885336691.

It is an arithmetic number, because the mean of its divisors is an integer number (3770673378).

Almost surely, 2^11312020131 is an apocalyptic number.

11312020131 is a deficient number, since it is larger than the sum of its proper divisors (3770673381).

11312020131 is an equidigital number, since it uses as much as digits as its factorization.

11312020131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3770673380.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 11312020131 its reverse (13102021311), we get a palindrome (24414041442).

The spelling of 11312020131 in words is "eleven billion, three hundred twelve million, twenty thousand, one hundred thirty-one".