31000022333213 has 8 divisors (see below), whose sum is σ = 31461348475128. Its totient is φ = 30539687226624.

The previous prime is 31000022333209. The next prime is 31000022333233. The reversal of 31000022333213 is 31233322000013.

It can be written as a sum of positive squares in 4 ways, for example, as 6422641009849 + 24577381323364 = 2534293^2 + 4957558^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31000022333213 - 2² = 31000022333209 is a prime.

It is a super-2 number, since 2×31000022333213² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31000022333233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 247695806 + ... + 247820927.

It is an arithmetic number, because the mean of its divisors is an integer number (3932668559391).

Almost surely, 2^{31000022333213} is an apocalyptic number.

It is an amenable number.

31000022333213 is a deficient number, since it is larger than the sum of its proper divisors (461326141915).

31000022333213 is an equidigital number, since it uses as much as digits as its factorization.

31000022333213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495517663.

The product of its (nonzero) digits is 1944, while the sum is 23.

Adding to 31000022333213 its reverse (31233322000013), we get a palindrome (62233344333226).

The spelling of 31000022333213 in words is "thirty-one trillion, twenty-two million, three hundred thirty-three thousand, two hundred thirteen".