31000133123 has 2 divisors, whose sum is σ = 31000133124. Its totient is φ = 31000133122.

The previous prime is 31000133077. The next prime is 31000133137. The reversal of 31000133123 is 32133100013.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31000133123 is a prime.

It is a super-2 number, since 2×31000133123² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31000133023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15500066561 + 15500066562.

It is an arithmetic number, because the mean of its divisors is an integer number (15500066562).

Almost surely, 2^31000133123 is an apocalyptic number.

31000133123 is a deficient number, since it is larger than the sum of its proper divisors (1).

31000133123 is an equidigital number, since it uses as much as digits as its factorization.

31000133123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 17.

Adding to 31000133123 its reverse (32133100013), we get a palindrome (63133233136).

The spelling of 31000133123 in words is "thirty-one billion, one hundred thirty-three thousand, one hundred twenty-three".