1556887249 has 2 divisors, whose sum is σ = 1556887250. Its totient is φ = 1556887248.

The previous prime is 1556887229. The next prime is 1556887261. The reversal of 1556887249 is 9427886551.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1556854849 + 32400 = 39457^2 + 180^2 .

It is a cyclic number.

It is not a de Polignac number, because 1556887249 - 2²³ = 1548498641 is a prime.

It is a super-3 number, since 3×1556887249³ (a number of 29 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1556887249.

It is not a weakly prime, because it can be changed into another prime (1556887229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 778443624 + 778443625.

It is an arithmetic number, because the mean of its divisors is an integer number (778443625).

Almost surely, 2^1556887249 is an apocalyptic number.

It is an amenable number.

1556887249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1556887249 is an equidigital number, since it uses as much as digits as its factorization.

1556887249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4838400, while the sum is 55.

The square root of 1556887249 is about 39457.4105713996. The cubic root of 1556887249 is about 1159.0060969796.

The spelling of 1556887249 in words is "one billion, five hundred fifty-six million, eight hundred eighty-seven thousand, two hundred forty-nine".