2147245891 has 32 divisors (see below), whose sum is σ = 2636540928. Its totient is φ = 1708776960.

The previous prime is 2147245853. The next prime is 2147245913. The reversal of 2147245891 is 1985427412.

It is a cyclic number.

It is not a de Polignac number, because 2147245891 - 2¹³ = 2147237699 is a prime.

It is a super-2 number, since 2×2147245891² = 9221329832832767762, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2147245801) 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, 1497711 + ... + 1499143.

It is an arithmetic number, because the mean of its divisors is an integer number (82391904).

Almost surely, 2^2147245891 is an apocalyptic number.

2147245891 is a deficient number, since it is larger than the sum of its proper divisors (489295037).

2147245891 is a wasteful number, since it uses less digits than its factorization.

2147245891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1731.

The product of its digits is 161280, while the sum is 43.

The square root of 2147245891 is about 46338.3846395189. The cubic root of 2147245891 is about 1290.1115403423. Note that the first 3 decimals are identical.

The spelling of 2147245891 in words is "two billion, one hundred forty-seven million, two hundred forty-five thousand, eight hundred ninety-one".