1670200391 has 2 divisors, whose sum is σ = 1670200392. Its totient is φ = 1670200390.

The previous prime is 1670200327. The next prime is 1670200409. The reversal of 1670200391 is 1930020761.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1670200391 - 2⁶ = 1670200327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1670200691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 835100195 + 835100196.

It is an arithmetic number, because the mean of its divisors is an integer number (835100196).

Almost surely, 2^1670200391 is an apocalyptic number.

1670200391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1670200391 is an equidigital number, since it uses as much as digits as its factorization.

1670200391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 1670200391 is about 40868.0852377500. The cubic root of 1670200391 is about 1186.4684486791.

The spelling of 1670200391 in words is "one billion, six hundred seventy million, two hundred thousand, three hundred ninety-one".