12001931 has 4 divisors (see below), whose sum is σ = 12120864. Its totient is φ = 11883000.

The previous prime is 12001921. The next prime is 12001943. The reversal of 12001931 is 13910021.

It is a happy number.

12001931 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13910021 = 137 ⋅101533.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12001931 is a prime.

It is a super-2 number, since 2×12001931² = 288092695457522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12001921) 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, 59315 + ... + 59516.

It is an arithmetic number, because the mean of its divisors is an integer number (3030216).

Almost surely, 2^12001931 is an apocalyptic number.

12001931 is a deficient number, since it is larger than the sum of its proper divisors (118933).

12001931 is a wasteful number, since it uses less digits than its factorization.

12001931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118932.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 12001931 is about 3464.3803197686. The cubic root of 12001931 is about 228.9551280920.

Adding to 12001931 its reverse (13910021), we get a palindrome (25911952).

The spelling of 12001931 in words is "twelve million, one thousand, nine hundred thirty-one".