31031213023 has 2 divisors, whose sum is σ = 31031213024. Its totient is φ = 31031213022.

The previous prime is 31031212997. The next prime is 31031213047. The reversal of 31031213023 is 32031213013.

It is a strong prime.

It is an emirp because it is prime and its reverse (32031213013) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31031213023 is a prime.

It is a super-3 number, since 3×31031213023³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31031213723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15515606511 + 15515606512.

It is an arithmetic number, because the mean of its divisors is an integer number (15515606512).

Almost surely, 2^31031213023 is an apocalyptic number.

31031213023 is a deficient number, since it is larger than the sum of its proper divisors (1).

31031213023 is an equidigital number, since it uses as much as digits as its factorization.

31031213023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 31031213023 its reverse (32031213013), we get a palindrome (63062426036).

The spelling of 31031213023 in words is "thirty-one billion, thirty-one million, two hundred thirteen thousand, twenty-three".