31432121 has 8 divisors (see below), whose sum is σ = 36415104. Its totient is φ = 26572320.

The previous prime is 31432111. The next prime is 31432153. The reversal of 31432121 is 12123413.

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

It is a cyclic number.

It is not a de Polignac number, because 31432121 - 2⁶ = 31432057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31432121.

It is not an unprimeable number, because it can be changed into a prime (31432111) 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, 30245 + ... + 31266.

It is an arithmetic number, because the mean of its divisors is an integer number (4551888).

Almost surely, 2^31432121 is an apocalyptic number.

It is an amenable number.

31432121 is a deficient number, since it is larger than the sum of its proper divisors (4982983).

31432121 is an equidigital number, since it uses as much as digits as its factorization.

31432121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61591.

The product of its digits is 144, while the sum is 17.

The square root of 31432121 is about 5606.4356769698. The cubic root of 31432121 is about 315.5909658561.

Adding to 31432121 its reverse (12123413), we get a palindrome (43555534).

The spelling of 31432121 in words is "thirty-one million, four hundred thirty-two thousand, one hundred twenty-one".