31070213 has 4 divisors (see below), whose sum is σ = 31276128. Its totient is φ = 30864300.

The previous prime is 31070197. The next prime is 31070219. The reversal of 31070213 is 31207013.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31207013 = 47 ⋅663979.

It is a cyclic number.

It is not a de Polignac number, because 31070213 - 2⁴ = 31070197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31070191 and 31070200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31070219) 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, 102731 + ... + 103032.

It is an arithmetic number, because the mean of its divisors is an integer number (7819032).

Almost surely, 2^31070213 is an apocalyptic number.

It is an amenable number.

31070213 is a deficient number, since it is larger than the sum of its proper divisors (205915).

31070213 is a wasteful number, since it uses less digits than its factorization.

31070213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205914.

The product of its (nonzero) digits is 126, while the sum is 17.

The square root of 31070213 is about 5574.0661101210. The cubic root of 31070213 is about 314.3750538914.

Adding to 31070213 its reverse (31207013), we get a palindrome (62277226).

The spelling of 31070213 in words is "thirty-one million, seventy thousand, two hundred thirteen".