1691058487 has 2 divisors, whose sum is σ = 1691058488. Its totient is φ = 1691058486.

The previous prime is 1691058451. The next prime is 1691058497. The reversal of 1691058487 is 7848501961.

It is a strong prime.

It is an emirp because it is prime and its reverse (7848501961) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1691058487 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1691058487.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1691058497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 845529243 + 845529244.

It is an arithmetic number, because the mean of its divisors is an integer number (845529244).

Almost surely, 2^1691058487 is an apocalyptic number.

1691058487 is a deficient number, since it is larger than the sum of its proper divisors (1).

1691058487 is an equidigital number, since it uses as much as digits as its factorization.

1691058487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 483840, while the sum is 49.

The square root of 1691058487 is about 41122.4815277483. The cubic root of 1691058487 is about 1191.3870526927.

The spelling of 1691058487 in words is "one billion, six hundred ninety-one million, fifty-eight thousand, four hundred eighty-seven".