31564142 has 8 divisors (see below), whose sum is σ = 49404816. Its totient is φ = 15095872.

The previous prime is 31564139. The next prime is 31564147. The reversal of 31564142 is 24146513.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31564147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 343043 + ... + 343134.

It is an arithmetic number, because the mean of its divisors is an integer number (6175602).

Almost surely, 2^31564142 is an apocalyptic number.

31564142 is a deficient number, since it is larger than the sum of its proper divisors (17840674).

31564142 is a wasteful number, since it uses less digits than its factorization.

31564142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686202.

The product of its digits is 2880, while the sum is 26.

The square root of 31564142 is about 5618.1973977424. The cubic root of 31564142 is about 316.0321964204.

The spelling of 31564142 in words is "thirty-one million, five hundred sixty-four thousand, one hundred forty-two".