1670393909 has 2 divisors, whose sum is σ = 1670393910. Its totient is φ = 1670393908.

The previous prime is 1670393903. The next prime is 1670393917. The reversal of 1670393909 is 9093930761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1647142225 + 23251684 = 40585^2 + 4822^2 .

It is an emirp because it is prime and its reverse (9093930761) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1670393909 is a prime.

It is a super-2 number, since 2×1670393909² = 5580431622448600562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1670393903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 835196954 + 835196955.

It is an arithmetic number, because the mean of its divisors is an integer number (835196955).

Almost surely, 2^1670393909 is an apocalyptic number.

It is an amenable number.

1670393909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1670393909 is an equidigital number, since it uses as much as digits as its factorization.

1670393909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 275562, while the sum is 47.

The square root of 1670393909 is about 40870.4527623563. The cubic root of 1670393909 is about 1186.5142703533.

The spelling of 1670393909 in words is "one billion, six hundred seventy million, three hundred ninety-three thousand, nine hundred nine".