31122323431 has 4 divisors (see below), whose sum is σ = 32475467952. Its totient is φ = 29769178912.

The previous prime is 31122323411. The next prime is 31122323447. The reversal of 31122323431 is 13432322113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13432322113 = 7 ⋅1918903159.

It is a cyclic number.

It is not a de Polignac number, because 31122323431 - 2⁹ = 31122322919 is a prime.

It is a super-2 number, since 2×31122323431² (a number of 22 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 = 31122323396 and 31122323405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31122323411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 676572226 + ... + 676572271.

It is an arithmetic number, because the mean of its divisors is an integer number (8118866988).

Almost surely, 2^31122323431 is an apocalyptic number.

31122323431 is a deficient number, since it is larger than the sum of its proper divisors (1353144521).

31122323431 is a wasteful number, since it uses less digits than its factorization.

31122323431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1353144520.

The product of its digits is 2592, while the sum is 25.

Adding to 31122323431 its reverse (13432322113), we get a palindrome (44554645544).

The spelling of 31122323431 in words is "thirty-one billion, one hundred twenty-two million, three hundred twenty-three thousand, four hundred thirty-one".