115721069 has 2 divisors, whose sum is σ = 115721070. Its totient is φ = 115721068.

The previous prime is 115721033. The next prime is 115721113. The reversal of 115721069 is 960127511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112254025 + 3467044 = 10595^2 + 1862^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-115721069 is a prime.

It is a super-2 number, since 2×115721069² = 26782731621005522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115721009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57860534 + 57860535.

It is an arithmetic number, because the mean of its divisors is an integer number (57860535).

Almost surely, 2^115721069 is an apocalyptic number.

It is an amenable number.

115721069 is a deficient number, since it is larger than the sum of its proper divisors (1).

115721069 is an equidigital number, since it uses as much as digits as its factorization.

115721069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3780, while the sum is 32.

The square root of 115721069 is about 10757.3727740559. The cubic root of 115721069 is about 487.3086782887.

The spelling of 115721069 in words is "one hundred fifteen million, seven hundred twenty-one thousand, sixty-nine".