1961222183 has 4 divisors (see below), whose sum is σ = 1961716368. Its totient is φ = 1960728000.

The previous prime is 1961222129. The next prime is 1961222209. The reversal of 1961222183 is 3812221691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3812221691 = 26879 ⋅141829.

It is a cyclic number.

It is not a de Polignac number, because 1961222183 - 2¹⁸ = 1960960039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1961222113) 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, 241091 + ... + 249092.

It is an arithmetic number, because the mean of its divisors is an integer number (490429092).

Almost surely, 2^1961222183 is an apocalyptic number.

1961222183 is a deficient number, since it is larger than the sum of its proper divisors (494185).

1961222183 is an equidigital number, since it uses as much as digits as its factorization.

1961222183 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494184.

The product of its digits is 10368, while the sum is 35.

The square root of 1961222183 is about 44285.6882412366. The cubic root of 1961222183 is about 1251.7250173969.

The spelling of 1961222183 in words is "one billion, nine hundred sixty-one million, two hundred twenty-two thousand, one hundred eighty-three".