31430121 has 16 divisors (see below), whose sum is σ = 43998336. Its totient is φ = 19918976.

The previous prime is 31430117. The next prime is 31430143. The reversal of 31430121 is 12103413.

It is a cyclic number.

It is not a de Polignac number, because 31430121 - 2² = 31430117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31430121.

It is not an unprimeable number, because it can be changed into a prime (31430221) 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 15 ways as a sum of consecutive naturals, for example, 10621 + ... + 13253.

It is an arithmetic number, because the mean of its divisors is an integer number (2749896).

Almost surely, 2^31430121 is an apocalyptic number.

It is an amenable number.

31430121 is a deficient number, since it is larger than the sum of its proper divisors (12568215).

31430121 is a wasteful number, since it uses less digits than its factorization.

31430121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2832.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 31430121 is about 5606.2573076875. The cubic root of 31430121 is about 315.5842721162.

Adding to 31430121 its reverse (12103413), we get a palindrome (43533534).

The spelling of 31430121 in words is "thirty-one million, four hundred thirty thousand, one hundred twenty-one".