31142121 has 8 divisors (see below), whose sum is σ = 43708320. Its totient is φ = 19668672.

The previous prime is 31142119. The next prime is 31142129. The reversal of 31142121 is 12124113.

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

It is not a de Polignac number, because 31142121 - 2¹ = 31142119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31142121.

It is not an unprimeable number, because it can be changed into a prime (31142129) 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, 273120 + ... + 273233.

It is an arithmetic number, because the mean of its divisors is an integer number (5463540).

Almost surely, 2^31142121 is an apocalyptic number.

It is an amenable number.

31142121 is a deficient number, since it is larger than the sum of its proper divisors (12566199).

31142121 is a wasteful number, since it uses less digits than its factorization.

31142121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546375.

The product of its digits is 48, while the sum is 15.

The square root of 31142121 is about 5580.5126108629. The cubic root of 31142121 is about 314.6173938687.

Adding to 31142121 its reverse (12124113), we get a palindrome (43266234).

The spelling of 31142121 in words is "thirty-one million, one hundred forty-two thousand, one hundred twenty-one".