1691057959 has 8 divisors (see below), whose sum is σ = 1708113920. Its totient is φ = 1674060696.

The previous prime is 1691057917. The next prime is 1691057971. The reversal of 1691057959 is 9597501961.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1691057959 - 2¹⁹ = 1690533671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1691097959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44422 + ... + 73180.

It is an arithmetic number, because the mean of its divisors is an integer number (213514240).

Almost surely, 2^1691057959 is an apocalyptic number.

1691057959 is a deficient number, since it is larger than the sum of its proper divisors (17055961).

1691057959 is a wasteful number, since it uses less digits than its factorization.

1691057959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29349.

The product of its (nonzero) digits is 765450, while the sum is 52.

The square root of 1691057959 is about 41122.4751079018. The cubic root of 1691057959 is about 1191.3869286969.

The spelling of 1691057959 in words is "one billion, six hundred ninety-one million, fifty-seven thousand, nine hundred fifty-nine".