31031121031 has 2 divisors, whose sum is σ = 31031121032. Its totient is φ = 31031121030.

The previous prime is 31031121019. The next prime is 31031121061. The reversal of 31031121031 is 13012113013.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31031121031 - 2¹³ = 31031112839 is a prime.

It is a super-2 number, since 2×31031121031² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31031120996 and 31031121014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31031121001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15515560515 + 15515560516.

It is an arithmetic number, because the mean of its divisors is an integer number (15515560516).

Almost surely, 2^31031121031 is an apocalyptic number.

31031121031 is a deficient number, since it is larger than the sum of its proper divisors (1).

31031121031 is an equidigital number, since it uses as much as digits as its factorization.

31031121031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 16.

Adding to 31031121031 its reverse (13012113013), we get a palindrome (44043234044).

The spelling of 31031121031 in words is "thirty-one billion, thirty-one million, one hundred twenty-one thousand, thirty-one".