1081236449 has 2 divisors, whose sum is σ = 1081236450. Its totient is φ = 1081236448.

The previous prime is 1081236437. The next prime is 1081236491. The reversal of 1081236449 is 9446321801.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1079779600 + 1456849 = 32860^2 + 1207^2 .

It is a cyclic number.

It is not a de Polignac number, because 1081236449 - 2²⁰ = 1080187873 is a prime.

It is a super-2 number, since 2×1081236449² = 2338144517292259202, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1081236349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 540618224 + 540618225.

It is an arithmetic number, because the mean of its divisors is an integer number (540618225).

Almost surely, 2^1081236449 is an apocalyptic number.

It is an amenable number.

1081236449 is a deficient number, since it is larger than the sum of its proper divisors (1).

1081236449 is an equidigital number, since it uses as much as digits as its factorization.

1081236449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 1081236449 is about 32882.1600415788. The cubic root of 1081236449 is about 1026.3769553585.

The spelling of 1081236449 in words is "one billion, eighty-one million, two hundred thirty-six thousand, four hundred forty-nine".