31542213 has 4 divisors (see below), whose sum is σ = 42056288. Its totient is φ = 21028140.

The previous prime is 31542197. The next prime is 31542229. The reversal of 31542213 is 31224513.

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.

It is an interprime number because it is at equal distance from previous prime (31542197) and next prime (31542229).

It is not a de Polignac number, because 31542213 - 2⁴ = 31542197 is a prime.

It is a super-2 number, since 2×31542213² = 1989822401874738, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31542213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31542233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5257033 + ... + 5257038.

It is an arithmetic number, because the mean of its divisors is an integer number (10514072).

Almost surely, 2^31542213 is an apocalyptic number.

It is an amenable number.

31542213 is a deficient number, since it is larger than the sum of its proper divisors (10514075).

31542213 is a wasteful number, since it uses less digits than its factorization.

31542213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10514074.

The product of its digits is 720, while the sum is 21.

The square root of 31542213 is about 5616.2454540378. The cubic root of 31542213 is about 315.9589923019.

Adding to 31542213 its reverse (31224513), we get a palindrome (62766726).

The spelling of 31542213 in words is "thirty-one million, five hundred forty-two thousand, two hundred thirteen".