31004123 has 4 divisors (see below), whose sum is σ = 32004288. Its totient is φ = 30003960.

The previous prime is 31004119. The next prime is 31004147. The reversal of 31004123 is 32140013.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31004123 - 2² = 31004119 is a prime.

It is a super-2 number, since 2×31004123² = 1922511285998258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31004098 and 31004107.

It is not an unprimeable number, because it can be changed into a prime (31004153) 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, 500036 + ... + 500097.

It is an arithmetic number, because the mean of its divisors is an integer number (8001072).

Almost surely, 2^31004123 is an apocalyptic number.

31004123 is a deficient number, since it is larger than the sum of its proper divisors (1000165).

31004123 is a wasteful number, since it uses less digits than its factorization.

31004123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000164.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 31004123 is about 5568.1346068499. The cubic root of 31004123 is about 314.1519914093.

Adding to 31004123 its reverse (32140013), we get a palindrome (63144136).

The spelling of 31004123 in words is "thirty-one million, four thousand, one hundred twenty-three".