1691168461 has 4 divisors (see below), whose sum is σ = 1691720800. Its totient is φ = 1690616124.

The previous prime is 1691168459. The next prime is 1691168471. The reversal of 1691168461 is 1648611961.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1691168461 - 2¹ = 1691168459 is a prime.

It is a super-2 number, since 2×1691168461² = 5720101526962217042, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1691168411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 271551 + ... + 277708.

It is an arithmetic number, because the mean of its divisors is an integer number (422930200).

Almost surely, 2^1691168461 is an apocalyptic number.

It is an amenable number.

1691168461 is a deficient number, since it is larger than the sum of its proper divisors (552339).

1691168461 is an equidigital number, since it uses as much as digits as its factorization.

1691168461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552338.

The product of its digits is 62208, while the sum is 43.

The square root of 1691168461 is about 41123.8186578046. The cubic root of 1691168461 is about 1191.4128784818.

The spelling of 1691168461 in words is "one billion, six hundred ninety-one million, one hundred sixty-eight thousand, four hundred sixty-one".