31001103123 has 4 divisors (see below), whose sum is σ = 41334804168. Its totient is φ = 20667402080.

The previous prime is 31001103109. The next prime is 31001103149. The reversal of 31001103123 is 32130110013.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32130110013 = 3 ⋅10710036671.

It is a cyclic number.

It is not a de Polignac number, because 31001103123 - 2⁶ = 31001103059 is a prime.

It is a super-2 number, since 2×31001103123² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31001103163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5166850518 + ... + 5166850523.

It is an arithmetic number, because the mean of its divisors is an integer number (10333701042).

Almost surely, 2^31001103123 is an apocalyptic number.

31001103123 is a deficient number, since it is larger than the sum of its proper divisors (10333701045).

31001103123 is a wasteful number, since it uses less digits than its factorization.

31001103123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10333701044.

The product of its (nonzero) digits is 54, while the sum is 15.

Adding to 31001103123 its reverse (32130110013), we get a palindrome (63131213136).

The spelling of 31001103123 in words is "thirty-one billion, one million, one hundred three thousand, one hundred twenty-three".