1136721689 has 2 divisors, whose sum is σ = 1136721690. Its totient is φ = 1136721688.

The previous prime is 1136721661. The next prime is 1136721737. The reversal of 1136721689 is 9861276311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 717168400 + 419553289 = 26780^2 + 20483^2 .

It is a cyclic number.

It is not a de Polignac number, because 1136721689 - 2¹⁶ = 1136656153 is a prime.

It is not a weakly prime, because it can be changed into another prime (1136721629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 568360844 + 568360845.

It is an arithmetic number, because the mean of its divisors is an integer number (568360845).

Almost surely, 2^1136721689 is an apocalyptic number.

It is an amenable number.

1136721689 is a deficient number, since it is larger than the sum of its proper divisors (1).

1136721689 is an equidigital number, since it uses as much as digits as its factorization.

1136721689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 44.

The square root of 1136721689 is about 33715.3034837298. The cubic root of 1136721689 is about 1043.6416005895.

The spelling of 1136721689 in words is "one billion, one hundred thirty-six million, seven hundred twenty-one thousand, six hundred eighty-nine".