31142147 has 16 divisors (see below), whose sum is σ = 34149600. Its totient is φ = 28285440.

The previous prime is 31142129. The next prime is 31142179. The reversal of 31142147 is 74124113.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31142147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31142117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60929 + ... + 61437.

It is an arithmetic number, because the mean of its divisors is an integer number (2134350).

Almost surely, 2^31142147 is an apocalyptic number.

31142147 is a deficient number, since it is larger than the sum of its proper divisors (3007453).

31142147 is a wasteful number, since it uses less digits than its factorization.

31142147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646.

The product of its digits is 672, while the sum is 23.

The square root of 31142147 is about 5580.5149403975. The cubic root of 31142147 is about 314.6174814248.

The spelling of 31142147 in words is "thirty-one million, one hundred forty-two thousand, one hundred forty-seven".