31351242 has 16 divisors (see below), whose sum is σ = 67525920. Its totient is φ = 9646512.

The previous prime is 31351241. The next prime is 31351253. The reversal of 31351242 is 24215313.

It is not an unprimeable number, because it can be changed into a prime (31351241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 200892 + ... + 201047.

It is an arithmetic number, because the mean of its divisors is an integer number (4220370).

Almost surely, 2^31351242 is an apocalyptic number.

31351242 is an abundant number, since it is smaller than the sum of its proper divisors (36174678).

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

31351242 is a wasteful number, since it uses less digits than its factorization.

31351242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401957.

The product of its digits is 720, while the sum is 21.

The square root of 31351242 is about 5599.2179811113. The cubic root of 31351242 is about 315.3200476037.

Adding to 31351242 its reverse (24215313), we get a palindrome (55566555).

The spelling of 31351242 in words is "thirty-one million, three hundred fifty-one thousand, two hundred forty-two".