31420213 has 8 divisors (see below), whose sum is σ = 34332480. Its totient is φ = 28517280.

The previous prime is 31420189. The next prime is 31420217. The reversal of 31420213 is 31202413.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-31420213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31420217) 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, 6033 + ... + 9961.

It is an arithmetic number, because the mean of its divisors is an integer number (4291560).

Almost surely, 2^31420213 is an apocalyptic number.

It is an amenable number.

31420213 is a deficient number, since it is larger than the sum of its proper divisors (2912267).

31420213 is a wasteful number, since it uses less digits than its factorization.

31420213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4667.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 31420213 is about 5605.3735825545. The cubic root of 31420213 is about 315.5511071406.

Adding to 31420213 its reverse (31202413), we get a palindrome (62622626).

The spelling of 31420213 in words is "thirty-one million, four hundred twenty thousand, two hundred thirteen".