1670125991 has 2 divisors, whose sum is σ = 1670125992. Its totient is φ = 1670125990.

The previous prime is 1670125967. The next prime is 1670125999. The reversal of 1670125991 is 1995210761.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1670125991 - 2²⁶ = 1603017127 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1670125999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 835062995 + 835062996.

It is an arithmetic number, because the mean of its divisors is an integer number (835062996).

Almost surely, 2^1670125991 is an apocalyptic number.

1670125991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1670125991 is an equidigital number, since it uses as much as digits as its factorization.

1670125991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34020, while the sum is 41.

The square root of 1670125991 is about 40867.1749818849. The cubic root of 1670125991 is about 1186.4508311198.

The spelling of 1670125991 in words is "one billion, six hundred seventy million, one hundred twenty-five thousand, nine hundred ninety-one".