2156310505 has 4 divisors (see below), whose sum is σ = 2587572612. Its totient is φ = 1725048400.

The previous prime is 2156310503. The next prime is 2156310511. The reversal of 2156310505 is 5050136512.

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 1573232896 + 583077609 = 39664^2 + 24147^2 .

It is not a de Polignac number, because 2156310505 - 2¹ = 2156310503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2156310503) 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, 215631046 + ... + 215631055.

It is an arithmetic number, because the mean of its divisors is an integer number (646893153).

Almost surely, 2^2156310505 is an apocalyptic number.

It is an amenable number.

2156310505 is a deficient number, since it is larger than the sum of its proper divisors (431262107).

2156310505 is an equidigital number, since it uses as much as digits as its factorization.

2156310505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431262106.

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 2156310505 is about 46436.0905438862. The cubic root of 2156310505 is about 1291.9243967892.

The spelling of 2156310505 in words is "two billion, one hundred fifty-six million, three hundred ten thousand, five hundred five".