1925227721 has 2 divisors, whose sum is σ = 1925227722. Its totient is φ = 1925227720.

The previous prime is 1925227663. The next prime is 1925227769. The reversal of 1925227721 is 1277225291.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1924050496 + 1177225 = 43864^2 + 1085^2 .

It is an emirp because it is prime and its reverse (1277225291) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1925227721 - 2⁶ = 1925227657 is a prime.

It is not a weakly prime, because it can be changed into another prime (1925227921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 962613860 + 962613861.

It is an arithmetic number, because the mean of its divisors is an integer number (962613861).

Almost surely, 2^1925227721 is an apocalyptic number.

It is an amenable number.

1925227721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1925227721 is an equidigital number, since it uses as much as digits as its factorization.

1925227721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35280, while the sum is 38.

The square root of 1925227721 is about 43877.4169818598. The cubic root of 1925227721 is about 1244.0200179521.

The spelling of 1925227721 in words is "one billion, nine hundred twenty-five million, two hundred twenty-seven thousand, seven hundred twenty-one".