1025122261 has 2 divisors, whose sum is σ = 1025122262. Its totient is φ = 1025122260.

The previous prime is 1025122207. The next prime is 1025122271. The reversal of 1025122261 is 1622215201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 897002500 + 128119761 = 29950^2 + 11319^2 .

It is a cyclic number.

It is not a de Polignac number, because 1025122261 - 2⁹ = 1025121749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1025122271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 512561130 + 512561131.

It is an arithmetic number, because the mean of its divisors is an integer number (512561131).

Almost surely, 2^1025122261 is an apocalyptic number.

It is an amenable number.

1025122261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1025122261 is an equidigital number, since it uses as much as digits as its factorization.

1025122261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 1025122261 is about 32017.5305262601. The cubic root of 1025122261 is about 1008.3049242973.

Adding to 1025122261 its reverse (1622215201), we get a palindrome (2647337462).

The spelling of 1025122261 in words is "one billion, twenty-five million, one hundred twenty-two thousand, two hundred sixty-one".