1228573861 has 2 divisors, whose sum is σ = 1228573862. Its totient is φ = 1228573860.

The previous prime is 1228573837. The next prime is 1228573873. The reversal of 1228573861 is 1683758221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 935992836 + 292581025 = 30594^2 + 17105^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1228573861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1228573831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614286930 + 614286931.

It is an arithmetic number, because the mean of its divisors is an integer number (614286931).

Almost surely, 2^1228573861 is an apocalyptic number.

It is an amenable number.

1228573861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1228573861 is an equidigital number, since it uses as much as digits as its factorization.

1228573861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 43.

The square root of 1228573861 is about 35051.0179738050. The cubic root of 1228573861 is about 1071.0270108496.

The spelling of 1228573861 in words is "one billion, two hundred twenty-eight million, five hundred seventy-three thousand, eight hundred sixty-one".