1691070539 has 4 divisors (see below), whose sum is σ = 1691242080. Its totient is φ = 1690899000.

The previous prime is 1691070517. The next prime is 1691070541. The reversal of 1691070539 is 9350701961.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1691070539 - 2²⁴ = 1674293323 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1691070496 and 1691070505.

It is not an unprimeable number, because it can be changed into a prime (1691070569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70019 + ... + 91020.

It is an arithmetic number, because the mean of its divisors is an integer number (422810520).

Almost surely, 2^1691070539 is an apocalyptic number.

1691070539 is a deficient number, since it is larger than the sum of its proper divisors (171541).

1691070539 is a wasteful number, since it uses less digits than its factorization.

1691070539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171540.

The product of its (nonzero) digits is 51030, while the sum is 41.

The square root of 1691070539 is about 41122.6280653365. The cubic root of 1691070539 is about 1191.3898829836.

The spelling of 1691070539 in words is "one billion, six hundred ninety-one million, seventy thousand, five hundred thirty-nine".