1691058461 has 4 divisors (see below), whose sum is σ = 1701829692. Its totient is φ = 1680287232.

The previous prime is 1691058451. The next prime is 1691058487. The reversal of 1691058461 is 1648501961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1648501961 = 22543 ⋅73127.

It can be written as a sum of positive squares in 2 ways, for example, as 1141155961 + 549902500 = 33781^2 + 23450^2 .

It is a cyclic number.

It is not a de Polignac number, because 1691058461 - 2¹⁴ = 1691042077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1691058451) 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, 5385380 + ... + 5385693.

It is an arithmetic number, because the mean of its divisors is an integer number (425457423).

Almost surely, 2^1691058461 is an apocalyptic number.

It is an amenable number.

1691058461 is a deficient number, since it is larger than the sum of its proper divisors (10771231).

1691058461 is a wasteful number, since it uses less digits than its factorization.

1691058461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10771230.

The product of its (nonzero) digits is 51840, while the sum is 41.

The square root of 1691058461 is about 41122.4812116195. The cubic root of 1691058461 is about 1191.3870465868.

The spelling of 1691058461 in words is "one billion, six hundred ninety-one million, fifty-eight thousand, four hundred sixty-one".