31011323123 has 32 divisors (see below), whose sum is σ = 35207749632. Its totient is φ = 27068580000.

The previous prime is 31011323113. The next prime is 31011323141. The reversal of 31011323123 is 32132311013.

It is not a de Polignac number, because 31011323123 - 2¹⁸ = 31011060979 is a prime.

It is a super-2 number, since 2×31011323123² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31011323095 and 31011323104.

It is not an unprimeable number, because it can be changed into a prime (31011323113) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23799290 + ... + 23800592.

It is an arithmetic number, because the mean of its divisors is an integer number (1100242176).

Almost surely, 2^31011323123 is an apocalyptic number.

31011323123 is a deficient number, since it is larger than the sum of its proper divisors (4196426509).

31011323123 is a wasteful number, since it uses less digits than its factorization.

31011323123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2175.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 31011323123 its reverse (32132311013), we get a palindrome (63143634136).

The spelling of 31011323123 in words is "thirty-one billion, eleven million, three hundred twenty-three thousand, one hundred twenty-three".