31421142 has 16 divisors (see below), whose sum is σ = 69824880. Its totient is φ = 10473696.

The previous prime is 31421141. The next prime is 31421153. The reversal of 31421142 is 24112413.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31421141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 290883 + ... + 290990.

It is an arithmetic number, because the mean of its divisors is an integer number (4364055).

Almost surely, 2^31421142 is an apocalyptic number.

31421142 is an abundant number, since it is smaller than the sum of its proper divisors (38403738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31421142 is a wasteful number, since it uses less digits than its factorization.

31421142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581884 (or 581878 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 31421142 is about 5605.4564488541. The cubic root of 31421142 is about 315.5542170717.

Adding to 31421142 its reverse (24112413), we get a palindrome (55533555).

The spelling of 31421142 in words is "thirty-one million, four hundred twenty-one thousand, one hundred forty-two".