2215431311 has 4 divisors (see below), whose sum is σ = 2215586400. Its totient is φ = 2215276224.

The previous prime is 2215431271. The next prime is 2215431341. The reversal of 2215431311 is 1131345122.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2215431311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2215431341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53666 + ... + 85503.

It is an arithmetic number, because the mean of its divisors is an integer number (553896600).

Almost surely, 2^2215431311 is an apocalyptic number.

2215431311 is a deficient number, since it is larger than the sum of its proper divisors (155089).

2215431311 is a wasteful number, since it uses less digits than its factorization.

2215431311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155088.

The product of its digits is 720, while the sum is 23.

The square root of 2215431311 is about 47068.3684760796. The cubic root of 2215431311 is about 1303.6252481070.

Adding to 2215431311 its reverse (1131345122), we get a palindrome (3346776433).

The spelling of 2215431311 in words is "two billion, two hundred fifteen million, four hundred thirty-one thousand, three hundred eleven".