1961574843 has 4 divisors (see below), whose sum is σ = 2615433128. Its totient is φ = 1307716560.

The previous prime is 1961574821. The next prime is 1961574847. The reversal of 1961574843 is 3484751691.

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

It is not a de Polignac number, because 1961574843 - 2¹⁰ = 1961573819 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1961574792 and 1961574801.

It is not an unprimeable number, because it can be changed into a prime (1961574847) 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, 326929138 + ... + 326929143.

It is an arithmetic number, because the mean of its divisors is an integer number (653858282).

Almost surely, 2^1961574843 is an apocalyptic number.

1961574843 is a deficient number, since it is larger than the sum of its proper divisors (653858285).

1961574843 is an equidigital number, since it uses as much as digits as its factorization.

1961574843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653858284.

The product of its digits is 725760, while the sum is 48.

The square root of 1961574843 is about 44289.6697097641. The cubic root of 1961574843 is about 1251.8000398144.

The spelling of 1961574843 in words is "one billion, nine hundred sixty-one million, five hundred seventy-four thousand, eight hundred forty-three".