2145311271 has 32 divisors (see below), whose sum is σ = 3209169600. Its totient is φ = 1416355200.

The previous prime is 2145311173. The next prime is 2145311303. The reversal of 2145311271 is 1721135412.

2145311271 is a `hidden beast` number, since 2 + 1 + 4 + 531 + 127 + 1 = 666.

It is not a de Polignac number, because 2145311271 - 2⁷ = 2145311143 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145311771) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1648321 + ... + 1649621.

It is an arithmetic number, because the mean of its divisors is an integer number (100286550).

Almost surely, 2^2145311271 is an apocalyptic number.

2145311271 is a deficient number, since it is larger than the sum of its proper divisors (1063858329).

2145311271 is a wasteful number, since it uses less digits than its factorization.

2145311271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1856 (or 1850 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 2145311271 is about 46317.5050170019. The cubic root of 2145311271 is about 1289.7239701452.

Adding to 2145311271 its reverse (1721135412), we get a palindrome (3866446683).

The spelling of 2145311271 in words is "two billion, one hundred forty-five million, three hundred eleven thousand, two hundred seventy-one".