31123304100113 has 4 divisors (see below), whose sum is σ = 31281290415540. Its totient is φ = 30965317784688.

The previous prime is 31123304100103. The next prime is 31123304100137. The reversal of 31123304100113 is 31100140332113.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16652218588369 + 14471085511744 = 4080713^2 + 3804088^2 .

It is a cyclic number.

It is not a de Polignac number, because 31123304100113 - 2¹⁶ = 31123304034577 is a prime.

It is a super-2 number, since 2×31123304100113² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31123304100103) 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, 78993157418 + ... + 78993157811.

It is an arithmetic number, because the mean of its divisors is an integer number (7820322603885).

Almost surely, 2^{31123304100113} is an apocalyptic number.

It is an amenable number.

31123304100113 is a deficient number, since it is larger than the sum of its proper divisors (157986315427).

31123304100113 is a wasteful number, since it uses less digits than its factorization.

31123304100113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157986315426.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 31123304100113 its reverse (31100140332113), we get a palindrome (62223444432226).

The spelling of 31123304100113 in words is "thirty-one trillion, one hundred twenty-three billion, three hundred four million, one hundred thousand, one hundred thirteen".