1961836823 has 4 divisors (see below), whose sum is σ = 2003578080. Its totient is φ = 1920095568.

The previous prime is 1961836813. The next prime is 1961836843. The reversal of 1961836823 is 3286381691.

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

It is a cyclic number.

It is not a de Polignac number, because 1961836823 - 2²⁶ = 1894727959 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47), and also a Moran number because the ratio is a prime number: 41741209 = 1961836823 / (1 + 9 + 6 + 1 + 8 + 3 + 6 + 8 + 2 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1961836813) 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, 20870558 + ... + 20870651.

It is an arithmetic number, because the mean of its divisors is an integer number (500894520).

Almost surely, 2^1961836823 is an apocalyptic number.

1961836823 is a deficient number, since it is larger than the sum of its proper divisors (41741257).

1961836823 is an equidigital number, since it uses as much as digits as its factorization.

1961836823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41741256.

The product of its digits is 373248, while the sum is 47.

The square root of 1961836823 is about 44292.6271855712. The cubic root of 1961836823 is about 1251.8557657833.

The spelling of 1961836823 in words is "one billion, nine hundred sixty-one million, eight hundred thirty-six thousand, eight hundred twenty-three".