1813637641 has 8 divisors (see below), whose sum is σ = 1878968520. Its totient is φ = 1748492928.

The previous prime is 1813637563. The next prime is 1813637669. The reversal of 1813637641 is 1467363181.

It can be written as a sum of positive squares in 4 ways, for example, as 1152942025 + 660695616 = 33955^2 + 25704^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1813637641 - 2¹⁹ = 1813113353 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1813637594 and 1813637603.

It is not an unprimeable number, because it can be changed into a prime (1813637041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26556 + ... + 65821.

It is an arithmetic number, because the mean of its divisors is an integer number (234871065).

Almost surely, 2^1813637641 is an apocalyptic number.

It is an amenable number.

1813637641 is a deficient number, since it is larger than the sum of its proper divisors (65330879).

1813637641 is an equidigital number, since it uses as much as digits as its factorization.

1813637641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93083.

The product of its digits is 72576, while the sum is 40.

The square root of 1813637641 is about 42586.8247348872. The cubic root of 1813637641 is about 1219.5047799723.

The spelling of 1813637641 in words is "one billion, eight hundred thirteen million, six hundred thirty-seven thousand, six hundred forty-one".