2145311405 has 8 divisors (see below), whose sum is σ = 2592895200. Its totient is φ = 1703901456.

The previous prime is 2145311401. The next prime is 2145311411. The reversal of 2145311405 is 5041135412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2145311405 - 2² = 2145311401 is a prime.

It is a super-2 number, since 2×2145311405² = 9204722048846148050, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145311401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1542695 + ... + 1544084.

It is an arithmetic number, because the mean of its divisors is an integer number (324111900).

Almost surely, 2^2145311405 is an apocalyptic number.

It is an amenable number.

2145311405 is a deficient number, since it is larger than the sum of its proper divisors (447583795).

2145311405 is a wasteful number, since it uses less digits than its factorization.

2145311405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3086923.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 2145311405 is about 46317.5064635392. The cubic root of 2145311405 is about 1289.7239969981.

Adding to 2145311405 its reverse (5041135412), we get a palindrome (7186446817).

The spelling of 2145311405 in words is "two billion, one hundred forty-five million, three hundred eleven thousand, four hundred five".