31240122132431 has 4 divisors (see below), whose sum is σ = 31327141971600. Its totient is φ = 31153102293264.

The previous prime is 31240122132421. The next prime is 31240122132467. The reversal of 31240122132431 is 13423122104213.

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 31240122132431 - 2⁴² = 26842075621327 is a prime.

It is a super-2 number, since 2×31240122132431² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31240122132394 and 31240122132403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31240122132421) 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, 43509919046 + ... + 43509919763.

It is an arithmetic number, because the mean of its divisors is an integer number (7831785492900).

Almost surely, 2^{31240122132431} is an apocalyptic number.

31240122132431 is a deficient number, since it is larger than the sum of its proper divisors (87019839169).

31240122132431 is an equidigital number, since it uses as much as digits as its factorization.

31240122132431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87019839168.

The product of its (nonzero) digits is 6912, while the sum is 29.

Adding to 31240122132431 its reverse (13423122104213), we get a palindrome (44663244236644).

The spelling of 31240122132431 in words is "thirty-one trillion, two hundred forty billion, one hundred twenty-two million, one hundred thirty-two thousand, four hundred thirty-one".