1955892221 has 4 divisors (see below), whose sum is σ = 1956007200. Its totient is φ = 1955777244.

The previous prime is 1955892217. The next prime is 1955892233. The reversal of 1955892221 is 1222985591.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1222985591 = 25523 ⋅47917.

It is a cyclic number.

It is not a de Polignac number, because 1955892221 - 2² = 1955892217 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 (1955892251) 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, 26351 + ... + 67868.

It is an arithmetic number, because the mean of its divisors is an integer number (489001800).

Almost surely, 2^1955892221 is an apocalyptic number.

It is an amenable number.

1955892221 is a deficient number, since it is larger than the sum of its proper divisors (114979).

1955892221 is an equidigital number, since it uses as much as digits as its factorization.

1955892221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114978.

The product of its digits is 129600, while the sum is 44.

The square root of 1955892221 is about 44225.4702744923. The cubic root of 1955892221 is about 1250.5900618977.

The spelling of 1955892221 in words is "one billion, nine hundred fifty-five million, eight hundred ninety-two thousand, two hundred twenty-one".