31138613 has 8 divisors (see below), whose sum is σ = 34610976. Its totient is φ = 27773200.

The previous prime is 31138559. The next prime is 31138637. The reversal of 31138613 is 31683113.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 31138613 - 2¹² = 31134517 is a prime.

It is a super-2 number, since 2×31138613² = 1939226439127538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31138643) 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, 26123 + ... + 27288.

It is an arithmetic number, because the mean of its divisors is an integer number (4326372).

Almost surely, 2^31138613 is an apocalyptic number.

It is an amenable number.

31138613 is a deficient number, since it is larger than the sum of its proper divisors (3472363).

31138613 is a wasteful number, since it uses less digits than its factorization.

31138613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53475.

The product of its digits is 1296, while the sum is 26.

The square root of 31138613 is about 5580.1982939677. The cubic root of 31138613 is about 314.6055800805.

The spelling of 31138613 in words is "thirty-one million, one hundred thirty-eight thousand, six hundred thirteen".