2145055947 has 4 divisors (see below), whose sum is σ = 2860074600. Its totient is φ = 1430037296.

The previous prime is 2145055933. The next prime is 2145055951. The reversal of 2145055947 is 7495505412.

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

It is a cyclic number.

It is not a de Polignac number, because 2145055947 - 2⁶ = 2145055883 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2145055899 and 2145055908.

It is not an unprimeable number, because it can be changed into a prime (2145055967) 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, 357509322 + ... + 357509327.

It is an arithmetic number, because the mean of its divisors is an integer number (715018650).

Almost surely, 2^2145055947 is an apocalyptic number.

2145055947 is a deficient number, since it is larger than the sum of its proper divisors (715018653).

2145055947 is an equidigital number, since it uses as much as digits as its factorization.

2145055947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715018652.

The product of its (nonzero) digits is 252000, while the sum is 42.

The square root of 2145055947 is about 46314.7486984438. The cubic root of 2145055947 is about 1289.6728026601.

The spelling of 2145055947 in words is "two billion, one hundred forty-five million, fifty-five thousand, nine hundred forty-seven".