31147138 has 8 divisors (see below), whose sum is σ = 50968080. Its totient is φ = 14157780.

The previous prime is 31147133. The next prime is 31147139. The reversal of 31147138 is 83174113.

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

It is a super-3 number, since 3×31147138³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (31147133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 707868 + ... + 707911.

It is an arithmetic number, because the mean of its divisors is an integer number (6371010).

Almost surely, 2^31147138 is an apocalyptic number.

31147138 is a deficient number, since it is larger than the sum of its proper divisors (19820942).

31147138 is a wasteful number, since it uses less digits than its factorization.

31147138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1415792.

The product of its digits is 2016, while the sum is 28.

The square root of 31147138 is about 5580.9621034370. The cubic root of 31147138 is about 314.6342879301.

The spelling of 31147138 in words is "thirty-one million, one hundred forty-seven thousand, one hundred thirty-eight".