1670438591 has 2 divisors, whose sum is σ = 1670438592. Its totient is φ = 1670438590.

The previous prime is 1670438543. The next prime is 1670438603. The reversal of 1670438591 is 1958340761.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1670438591 - 2⁶ = 1670438527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1670438521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 835219295 + 835219296.

It is an arithmetic number, because the mean of its divisors is an integer number (835219296).

Almost surely, 2^1670438591 is an apocalyptic number.

1670438591 is a deficient number, since it is larger than the sum of its proper divisors (1).

1670438591 is an equidigital number, since it uses as much as digits as its factorization.

1670438591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 1670438591 is about 40870.9993883193. Note that the first 3 decimals coincide. The cubic root of 1670438591 is about 1186.5248497656.

The spelling of 1670438591 in words is "one billion, six hundred seventy million, four hundred thirty-eight thousand, five hundred ninety-one".