3121240403 has 2 divisors, whose sum is σ = 3121240404. Its totient is φ = 3121240402.

The previous prime is 3121240399. The next prime is 3121240411. The reversal of 3121240403 is 3040421213.

It is a weak prime.

It is an emirp because it is prime and its reverse (3040421213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3121240403 - 2² = 3121240399 is a prime.

It is not a weakly prime, because it can be changed into another prime (3121242403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1560620201 + 1560620202.

It is an arithmetic number, because the mean of its divisors is an integer number (1560620202).

Almost surely, 2^3121240403 is an apocalyptic number.

3121240403 is a deficient number, since it is larger than the sum of its proper divisors (1).

3121240403 is an equidigital number, since it uses as much as digits as its factorization.

3121240403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 3121240403 is about 55868.0624596916. The cubic root of 3121240403 is about 1461.4223336520.

Adding to 3121240403 its reverse (3040421213), we get a palindrome (6161661616).

The spelling of 3121240403 in words is "three billion, one hundred twenty-one million, two hundred forty thousand, four hundred three".