1670005243 has 2 divisors, whose sum is σ = 1670005244. Its totient is φ = 1670005242.

The previous prime is 1670005201. The next prime is 1670005283. The reversal of 1670005243 is 3425000761.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1670005243 is a prime.

It is not a weakly prime, because it can be changed into another prime (1670005283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 835002621 + 835002622.

It is an arithmetic number, because the mean of its divisors is an integer number (835002622).

Almost surely, 2^1670005243 is an apocalyptic number.

1670005243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1670005243 is an equidigital number, since it uses as much as digits as its factorization.

1670005243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 1670005243 is about 40865.6976326111. The cubic root of 1670005243 is about 1186.4222374651.

The spelling of 1670005243 in words is "one billion, six hundred seventy million, five thousand, two hundred forty-three".