31030121 has 4 divisors (see below), whose sum is σ = 31045200. Its totient is φ = 31015044.

The previous prime is 31030093. The next prime is 31030123. The reversal of 31030121 is 12103013.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31030121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31030123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3851 + ... + 8768.

It is an arithmetic number, because the mean of its divisors is an integer number (7761300).

Almost surely, 2^31030121 is an apocalyptic number.

It is an amenable number.

31030121 is a deficient number, since it is larger than the sum of its proper divisors (15079).

31030121 is a wasteful number, since it uses less digits than its factorization.

31030121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15078.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 31030121 is about 5570.4686517384. The cubic root of 31030121 is about 314.2397758811.

Adding to 31030121 its reverse (12103013), we get a palindrome (43133134).

It can be divided in two parts, 3103012 and 1, that added together give a palindrome (3103013).

The spelling of 31030121 in words is "thirty-one million, thirty thousand, one hundred twenty-one".