2145645847 has 2 divisors, whose sum is σ = 2145645848. Its totient is φ = 2145645846.

The previous prime is 2145645841. The next prime is 2145645877. The reversal of 2145645847 is 7485465412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2145645847 - 2¹⁵ = 2145613079 is a prime.

It is a super-2 number, since 2×2145645847² = 9207592201496694818, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2145645797 and 2145645806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2145645841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072822923 + 1072822924.

It is an arithmetic number, because the mean of its divisors is an integer number (1072822924).

Almost surely, 2^2145645847 is an apocalyptic number.

2145645847 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145645847 is an equidigital number, since it uses as much as digits as its factorization.

2145645847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1075200, while the sum is 46.

The square root of 2145645847 is about 46321.1166424127. The cubic root of 2145645847 is about 1289.7910137584.

The spelling of 2145645847 in words is "two billion, one hundred forty-five million, six hundred forty-five thousand, eight hundred forty-seven".