31132121 has 4 divisors (see below), whose sum is σ = 31219200. Its totient is φ = 31045044.

The previous prime is 31132103. The next prime is 31132141. The reversal of 31132121 is 12123113.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12123113 = 953 ⋅12721.

It is a cyclic number.

It is not a de Polignac number, because 31132121 - 2¹⁴ = 31115737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31132096 and 31132105.

It is not an unprimeable number, because it can be changed into a prime (31132141) 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, 43001 + ... + 43718.

It is an arithmetic number, because the mean of its divisors is an integer number (7804800).

Almost surely, 2^31132121 is an apocalyptic number.

It is an amenable number.

31132121 is a deficient number, since it is larger than the sum of its proper divisors (87079).

31132121 is an equidigital number, since it uses as much as digits as its factorization.

31132121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87078.

The product of its digits is 36, while the sum is 14.

The square root of 31132121 is about 5579.6165638868. The cubic root of 31132121 is about 314.5837148230.

Adding to 31132121 its reverse (12123113), we get a palindrome (43255234).

The spelling of 31132121 in words is "thirty-one million, one hundred thirty-two thousand, one hundred twenty-one".