3121144405 has 4 divisors (see below), whose sum is σ = 3745373292. Its totient is φ = 2496915520.

The previous prime is 3121144399. The next prime is 3121144409. The reversal of 3121144405 is 5044411213.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1715119396 + 1406025009 = 41414^2 + 37497^2 .

It is not a de Polignac number, because 3121144405 - 2¹⁹ = 3120620117 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3121144405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121144409) 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, 312114436 + ... + 312114445.

It is an arithmetic number, because the mean of its divisors is an integer number (936343323).

Almost surely, 2^3121144405 is an apocalyptic number.

It is an amenable number.

3121144405 is a deficient number, since it is larger than the sum of its proper divisors (624228887).

3121144405 is an equidigital number, since it uses as much as digits as its factorization.

3121144405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624228886.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 3121144405 is about 55867.2033039063. The cubic root of 3121144405 is about 1461.4073508203.

Adding to 3121144405 its reverse (5044411213), we get a palindrome (8165555618).

The spelling of 3121144405 in words is "three billion, one hundred twenty-one million, one hundred forty-four thousand, four hundred five".