31213011 has 4 divisors (see below), whose sum is σ = 41617352. Its totient is φ = 20808672.

The previous prime is 31213009. The next prime is 31213027. The reversal of 31213011 is 11031213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11031213 = 3 ⋅3677071.

It is not a de Polignac number, because 31213011 - 2¹ = 31213009 is a prime.

It is a super-2 number, since 2×31213011² = 1948504111372242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31213051) 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, 5202166 + ... + 5202171.

It is an arithmetic number, because the mean of its divisors is an integer number (10404338).

Almost surely, 2^31213011 is an apocalyptic number.

31213011 is a deficient number, since it is larger than the sum of its proper divisors (10404341).

31213011 is a wasteful number, since it uses less digits than its factorization.

31213011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10404340.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 31213011 is about 5586.8605674386. The cubic root of 31213011 is about 314.8559381562.

Adding to 31213011 its reverse (11031213), we get a palindrome (42244224).

The spelling of 31213011 in words is "thirty-one million, two hundred thirteen thousand, eleven".