31249243117 has 4 divisors (see below), whose sum is σ = 31289669820. Its totient is φ = 31208816416.

The previous prime is 31249243097. The next prime is 31249243121. The reversal of 31249243117 is 71134294213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71134294213 = 29 ⋅2452906697.

It can be written as a sum of positive squares in 2 ways, for example, as 2857330116 + 28391913001 = 53454^2 + 168499^2 .

It is a cyclic number.

It is not a de Polignac number, because 31249243117 - 2¹¹ = 31249241069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31249243127) 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, 20212192 + ... + 20213737.

It is an arithmetic number, because the mean of its divisors is an integer number (7822417455).

Almost surely, 2^31249243117 is an apocalyptic number.

It is an amenable number.

31249243117 is a deficient number, since it is larger than the sum of its proper divisors (40426703).

31249243117 is an equidigital number, since it uses as much as digits as its factorization.

31249243117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40426702.

The product of its digits is 36288, while the sum is 37.

The spelling of 31249243117 in words is "thirty-one billion, two hundred forty-nine million, two hundred forty-three thousand, one hundred seventeen".