1228823581 has 2 divisors, whose sum is σ = 1228823582. Its totient is φ = 1228823580.

The previous prime is 1228823569. The next prime is 1228823611. The reversal of 1228823581 is 1853288221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1201731556 + 27092025 = 34666^2 + 5205^2 .

It is a cyclic number.

It is not a de Polignac number, because 1228823581 - 2⁹ = 1228823069 is a prime.

It is a super-2 number, since 2×1228823581² = 3020014786443327122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1228823501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614411790 + 614411791.

It is an arithmetic number, because the mean of its divisors is an integer number (614411791).

Almost surely, 2^1228823581 is an apocalyptic number.

It is an amenable number.

1228823581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1228823581 is an equidigital number, since it uses as much as digits as its factorization.

1228823581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61440, while the sum is 40.

The square root of 1228823581 is about 35054.5800288636. The cubic root of 1228823581 is about 1071.0995716060.

The spelling of 1228823581 in words is "one billion, two hundred twenty-eight million, eight hundred twenty-three thousand, five hundred eighty-one".