1025957221 has 2 divisors, whose sum is σ = 1025957222. Its totient is φ = 1025957220.

The previous prime is 1025957161. The next prime is 1025957239. The reversal of 1025957221 is 1227595201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 621504900 + 404452321 = 24930^2 + 20111^2 .

It is a cyclic number.

It is not a de Polignac number, because 1025957221 - 2⁹ = 1025956709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1025957281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 512978610 + 512978611.

It is an arithmetic number, because the mean of its divisors is an integer number (512978611).

Almost surely, 2^1025957221 is an apocalyptic number.

It is an amenable number.

1025957221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1025957221 is an equidigital number, since it uses as much as digits as its factorization.

1025957221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12600, while the sum is 34.

The square root of 1025957221 is about 32030.5669790592. The cubic root of 1025957221 is about 1008.5786041113.

The spelling of 1025957221 in words is "one billion, twenty-five million, nine hundred fifty-seven thousand, two hundred twenty-one".