31123431601 has 2 divisors, whose sum is σ = 31123431602. Its totient is φ = 31123431600.

The previous prime is 31123431589. The next prime is 31123431607. The reversal of 31123431601 is 10613432113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31108493376 + 14938225 = 176376^2 + 3865^2 .

It is a cyclic number.

It is not a de Polignac number, because 31123431601 - 2²⁷ = 30989213873 is a prime.

It is not a weakly prime, because it can be changed into another prime (31123431607) 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 as a sum of consecutive naturals, namely, 15561715800 + 15561715801.

It is an arithmetic number, because the mean of its divisors is an integer number (15561715801).

Almost surely, 2^31123431601 is an apocalyptic number.

It is an amenable number.

31123431601 is a deficient number, since it is larger than the sum of its proper divisors (1).

31123431601 is an equidigital number, since it uses as much as digits as its factorization.

31123431601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 31123431601 its reverse (10613432113), we get a palindrome (41736863714).

The spelling of 31123431601 in words is "thirty-one billion, one hundred twenty-three million, four hundred thirty-one thousand, six hundred one".