31104050213 has 4 divisors (see below), whose sum is σ = 31113831468. Its totient is φ = 31094268960.

The previous prime is 31104050177. The next prime is 31104050233. The reversal of 31104050213 is 31205040113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31205040113 = 13 ⋅2400387701.

It can be written as a sum of positive squares in 2 ways, for example, as 1347110209 + 29756940004 = 36703^2 + 172502^2 .

It is a cyclic number.

It is not a de Polignac number, because 31104050213 - 2¹⁰ = 31104049189 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 (31104050233) 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, 4885856 + ... + 4892217.

It is an arithmetic number, because the mean of its divisors is an integer number (7778457867).

Almost surely, 2^31104050213 is an apocalyptic number.

It is an amenable number.

31104050213 is a deficient number, since it is larger than the sum of its proper divisors (9781255).

31104050213 is an equidigital number, since it uses as much as digits as its factorization.

31104050213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9781254.

The product of its (nonzero) digits is 360, while the sum is 20.

Adding to 31104050213 its reverse (31205040113), we get a palindrome (62309090326).

The spelling of 31104050213 in words is "thirty-one billion, one hundred four million, fifty thousand, two hundred thirteen".