31130213 has 6 divisors (see below), whose sum is σ = 33069426. Its totient is φ = 29298752.

The previous prime is 31130171. The next prime is 31130221. The reversal of 31130213 is 31203113.

It can be written as a sum of positive squares in 3 ways, for example, as 9012004 + 22118209 = 3002^2 + 4703^2 .

It is not a de Polignac number, because 31130213 - 2⁶ = 31130149 is a prime.

It is a super-2 number, since 2×31130213² = 1938180322850738, which 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 (31130233) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53570 + ... + 54147.

It is an arithmetic number, because the mean of its divisors is an integer number (5511571).

Almost surely, 2^31130213 is an apocalyptic number.

It is an amenable number.

31130213 is a deficient number, since it is larger than the sum of its proper divisors (1939213).

31130213 is a wasteful number, since it uses less digits than its factorization.

31130213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107751 (or 107734 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 31130213 is about 5579.4455817760. The cubic root of 31130213 is about 314.5772880418.

Adding to 31130213 its reverse (31203113), we get a palindrome (62333326).

Subtracting 31130213 from its reverse (31203113), we obtain a square (72900 = 270²).

The spelling of 31130213 in words is "thirty-one million, one hundred thirty thousand, two hundred thirteen".