31042403 has 4 divisors (see below), whose sum is σ = 35477040. Its totient is φ = 26607768.

The previous prime is 31042397. The next prime is 31042421. The reversal of 31042403 is 30424013.

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 31042403 - 2¹⁰ = 31041379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31042463) 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, 2217308 + ... + 2217321.

It is an arithmetic number, because the mean of its divisors is an integer number (8869260).

Almost surely, 2^31042403 is an apocalyptic number.

31042403 is a deficient number, since it is larger than the sum of its proper divisors (4434637).

31042403 is an equidigital number, since it uses as much as digits as its factorization.

31042403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4434636.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 31042403 is about 5571.5709633819. The cubic root of 31042403 is about 314.2812300521.

Adding to 31042403 its reverse (30424013), we get a palindrome (61466416).

The spelling of 31042403 in words is "thirty-one million, forty-two thousand, four hundred three".