1228551557 has 2 divisors, whose sum is σ = 1228551558. Its totient is φ = 1228551556.

The previous prime is 1228551547. The next prime is 1228551617. The reversal of 1228551557 is 7551558221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1222271521 + 6280036 = 34961^2 + 2506^2 .

It is a cyclic number.

It is not a de Polignac number, because 1228551557 - 2⁸ = 1228551301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1228551547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614275778 + 614275779.

It is an arithmetic number, because the mean of its divisors is an integer number (614275779).

Almost surely, 2^1228551557 is an apocalyptic number.

It is an amenable number.

1228551557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1228551557 is an equidigital number, since it uses as much as digits as its factorization.

1228551557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 140000, while the sum is 41.

The square root of 1228551557 is about 35050.6998075645. The cubic root of 1228551557 is about 1071.0205295323.

The spelling of 1228551557 in words is "one billion, two hundred twenty-eight million, five hundred fifty-one thousand, five hundred fifty-seven".