31523144123 has 2 divisors, whose sum is σ = 31523144124. Its totient is φ = 31523144122.

The previous prime is 31523144117. The next prime is 31523144137. The reversal of 31523144123 is 32144132513.

It is a weak prime.

It is an emirp because it is prime and its reverse (32144132513) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31523144123 - 2¹⁴ = 31523127739 is a prime.

It is not a weakly prime, because it can be changed into another prime (31523144143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15761572061 + 15761572062.

It is an arithmetic number, because the mean of its divisors is an integer number (15761572062).

Almost surely, 2^31523144123 is an apocalyptic number.

31523144123 is a deficient number, since it is larger than the sum of its proper divisors (1).

31523144123 is an equidigital number, since it uses as much as digits as its factorization.

31523144123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 29.

Adding to 31523144123 its reverse (32144132513), we get a palindrome (63667276636).

The spelling of 31523144123 in words is "thirty-one billion, five hundred twenty-three million, one hundred forty-four thousand, one hundred twenty-three".