31621142 has 8 divisors (see below), whose sum is σ = 54207696. Its totient is φ = 13551912.

The previous prime is 31621141. The next prime is 31621151. The reversal of 31621142 is 24112613.

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 (31621141) 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, 1129313 + ... + 1129340.

It is an arithmetic number, because the mean of its divisors is an integer number (6775962).

Almost surely, 2^31621142 is an apocalyptic number.

31621142 is a deficient number, since it is larger than the sum of its proper divisors (22586554).

31621142 is a wasteful number, since it uses less digits than its factorization.

31621142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2258662.

The product of its digits is 288, while the sum is 20.

The square root of 31621142 is about 5623.2679110994. The cubic root of 31621142 is about 316.2223172507. Note that the first 3 decimals are identical.

Adding to 31621142 its reverse (24112613), we get a palindrome (55733755).

The spelling of 31621142 in words is "thirty-one million, six hundred twenty-one thousand, one hundred forty-two".