31043121 has 16 divisors (see below), whose sum is σ = 42874368. Its totient is φ = 19958400.

The previous prime is 31043101. The next prime is 31043141. The reversal of 31043121 is 12134013.

It is an interprime number because it is at equal distance from previous prime (31043101) and next prime (31043141).

It is not a de Polignac number, because 31043121 - 2¹⁰ = 31042097 is a prime.

It is a super-2 number, since 2×31043121² = 1927350722841282, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31043121.

It is not an unprimeable number, because it can be changed into a prime (31043101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50005 + ... + 50621.

It is an arithmetic number, because the mean of its divisors is an integer number (2679648).

Almost surely, 2^31043121 is an apocalyptic number.

31043121 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

31043121 is a deficient number, since it is larger than the sum of its proper divisors (11831247).

31043121 is a wasteful number, since it uses less digits than its factorization.

31043121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1192.

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

The square root of 31043121 is about 5571.6353972599. The cubic root of 31043121 is about 314.2836531053.

Adding to 31043121 its reverse (12134013), we get a palindrome (43177134).

The spelling of 31043121 in words is "thirty-one million, forty-three thousand, one hundred twenty-one".