1641279823 has 4 divisors (see below), whose sum is σ = 1641510448. Its totient is φ = 1641049200.

The previous prime is 1641279799. The next prime is 1641279851. The reversal of 1641279823 is 3289721461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3289721461 = 13 ⋅253055497.

It is a cyclic number.

It is not a de Polignac number, because 1641279823 - 2⁵ = 1641279791 is a prime.

It is a super-2 number, since 2×1641279823² = 5387598914773822658, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1641279823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1641279623) 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, 104286 + ... + 118987.

It is an arithmetic number, because the mean of its divisors is an integer number (410377612).

Almost surely, 2^1641279823 is an apocalyptic number.

1641279823 is a deficient number, since it is larger than the sum of its proper divisors (230625).

1641279823 is an equidigital number, since it uses as much as digits as its factorization.

1641279823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230624.

The product of its digits is 145152, while the sum is 43.

The square root of 1641279823 is about 40512.7118692393. The cubic root of 1641279823 is about 1179.5803887229.

The spelling of 1641279823 in words is "one billion, six hundred forty-one million, two hundred seventy-nine thousand, eight hundred twenty-three".