1921550441 has 2 divisors, whose sum is σ = 1921550442. Its totient is φ = 1921550440.

The previous prime is 1921550437. The next prime is 1921550483. The reversal of 1921550441 is 1440551291.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1383542416 + 538008025 = 37196^2 + 23195^2 .

It is a cyclic number.

It is not a de Polignac number, because 1921550441 - 2² = 1921550437 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1921550398 and 1921550407.

It is not a weakly prime, because it can be changed into another prime (1921550641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960775220 + 960775221.

It is an arithmetic number, because the mean of its divisors is an integer number (960775221).

Almost surely, 2^1921550441 is an apocalyptic number.

It is an amenable number.

1921550441 is a deficient number, since it is larger than the sum of its proper divisors (1).

1921550441 is an equidigital number, since it uses as much as digits as its factorization.

1921550441 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 1921550441 is about 43835.4929366604. The cubic root of 1921550441 is about 1243.2274665822.

The spelling of 1921550441 in words is "one billion, nine hundred twenty-one million, five hundred fifty thousand, four hundred forty-one".