1680151493 has 2 divisors, whose sum is σ = 1680151494. Its totient is φ = 1680151492.

The previous prime is 1680151489. The next prime is 1680151573. The reversal of 1680151493 is 3941510861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1615879204 + 64272289 = 40198^2 + 8017^2 .

It is a cyclic number.

It is not a de Polignac number, because 1680151493 - 2² = 1680151489 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1680151793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840075746 + 840075747.

It is an arithmetic number, because the mean of its divisors is an integer number (840075747).

Almost surely, 2^1680151493 is an apocalyptic number.

It is an amenable number.

1680151493 is a deficient number, since it is larger than the sum of its proper divisors (1).

1680151493 is an equidigital number, since it uses as much as digits as its factorization.

1680151493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 1680151493 is about 40989.6510475510. The cubic root of 1680151493 is about 1188.8201221202.

The spelling of 1680151493 in words is "one billion, six hundred eighty million, one hundred fifty-one thousand, four hundred ninety-three".