1243540601 has 2 divisors, whose sum is σ = 1243540602. Its totient is φ = 1243540600.

The previous prime is 1243540589. The next prime is 1243540651. The reversal of 1243540601 is 1060453421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1079188201 + 164352400 = 32851^2 + 12820^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243540601 - 2³⁰ = 169798777 is a prime.

It is not a weakly prime, because it can be changed into another prime (1243540651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621770300 + 621770301.

It is an arithmetic number, because the mean of its divisors is an integer number (621770301).

Almost surely, 2^1243540601 is an apocalyptic number.

It is an amenable number.

1243540601 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243540601 is an equidigital number, since it uses as much as digits as its factorization.

1243540601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 1243540601 is about 35263.8710438885. The cubic root of 1243540601 is about 1075.3586259033.

The spelling of 1243540601 in words is "one billion, two hundred forty-three million, five hundred forty thousand, six hundred one".