1681341591 has 4 divisors (see below), whose sum is σ = 2241788792. Its totient is φ = 1120894392.

The previous prime is 1681341583. The next prime is 1681341593. The reversal of 1681341591 is 1951431861.

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

It is not a de Polignac number, because 1681341591 - 2³ = 1681341583 is a prime.

It is a super-2 number, since 2×1681341591² = 5653819091252822562, 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 (1681341593) 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, 280223596 + ... + 280223601.

It is an arithmetic number, because the mean of its divisors is an integer number (560447198).

Almost surely, 2^1681341591 is an apocalyptic number.

1681341591 is a deficient number, since it is larger than the sum of its proper divisors (560447201).

1681341591 is an equidigital number, since it uses as much as digits as its factorization.

1681341591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560447200.

The product of its digits is 25920, while the sum is 39.

The square root of 1681341591 is about 41004.1655322968. The cubic root of 1681341591 is about 1189.1007473172.

The spelling of 1681341591 in words is "one billion, six hundred eighty-one million, three hundred forty-one thousand, five hundred ninety-one".