31132613 has 4 divisors (see below), whose sum is σ = 31423680. Its totient is φ = 30841548.

The previous prime is 31132601. The next prime is 31132643. The reversal of 31132613 is 31623113.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 31132613 - 2¹⁶ = 31067077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31132643) 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, 145373 + ... + 145586.

It is an arithmetic number, because the mean of its divisors is an integer number (7855920).

Almost surely, 2^31132613 is an apocalyptic number.

It is an amenable number.

31132613 is a deficient number, since it is larger than the sum of its proper divisors (291067).

31132613 is a wasteful number, since it uses less digits than its factorization.

31132613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291066.

The product of its digits is 324, while the sum is 20.

The square root of 31132613 is about 5579.6606527638. The cubic root of 31132613 is about 314.5853720007.

Adding to 31132613 its reverse (31623113), we get a palindrome (62755726).

The spelling of 31132613 in words is "thirty-one million, one hundred thirty-two thousand, six hundred thirteen".