1251501089 has 2 divisors, whose sum is σ = 1251501090. Its totient is φ = 1251501088.

The previous prime is 1251501079. The next prime is 1251501113. The reversal of 1251501089 is 9801051521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1184392225 + 67108864 = 34415^2 + 8192^2 .

It is a cyclic number.

It is not a de Polignac number, because 1251501089 - 2¹² = 1251496993 is a prime.

It is not a weakly prime, because it can be changed into another prime (1251501059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625750544 + 625750545.

It is an arithmetic number, because the mean of its divisors is an integer number (625750545).

Almost surely, 2^1251501089 is an apocalyptic number.

It is an amenable number.

1251501089 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251501089 is an equidigital number, since it uses as much as digits as its factorization.

1251501089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 32.

The square root of 1251501089 is about 35376.5612941676. The cubic root of 1251501089 is about 1077.6483722878.

The spelling of 1251501089 in words is "one billion, two hundred fifty-one million, five hundred one thousand, eighty-nine".