31420013 has 4 divisors (see below), whose sum is σ = 31708380. Its totient is φ = 31131648.

The previous prime is 31420009. The next prime is 31420027. The reversal of 31420013 is 31002413.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27741289 + 3678724 = 5267^2 + 1918^2 .

It is a cyclic number.

It is not a de Polignac number, because 31420013 - 2² = 31420009 is a prime.

It is a super-3 number, since 3×31420013³ (a number of 23 digits) contains 333 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 31420013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31420033) 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, 144020 + ... + 144237.

It is an arithmetic number, because the mean of its divisors is an integer number (7927095).

Almost surely, 2^31420013 is an apocalyptic number.

It is an amenable number.

31420013 is a deficient number, since it is larger than the sum of its proper divisors (288367).

31420013 is a wasteful number, since it uses less digits than its factorization.

31420013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288366.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 31420013 is about 5605.3557425020. The cubic root of 31420013 is about 315.5504376103.

Adding to 31420013 its reverse (31002413), we get a palindrome (62422426).

The spelling of 31420013 in words is "thirty-one million, four hundred twenty thousand, thirteen".