1225088861 has 2 divisors, whose sum is σ = 1225088862. Its totient is φ = 1225088860.

The previous prime is 1225088801. The next prime is 1225088933. The reversal of 1225088861 is 1688805221.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 730026361 + 495062500 = 27019^2 + 22250^2 .

It is an emirp because it is prime and its reverse (1688805221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1225088861 - 2²⁶ = 1157979997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1225088801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612544430 + 612544431.

It is an arithmetic number, because the mean of its divisors is an integer number (612544431).

Almost surely, 2^1225088861 is an apocalyptic number.

It is an amenable number.

1225088861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225088861 is an equidigital number, since it uses as much as digits as its factorization.

1225088861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 61440, while the sum is 41.

The square root of 1225088861 is about 35001.2694198368. The cubic root of 1225088861 is about 1070.0133520912.

The spelling of 1225088861 in words is "one billion, two hundred twenty-five million, eighty-eight thousand, eight hundred sixty-one".