1243377601 has 2 divisors, whose sum is σ = 1243377602. Its totient is φ = 1243377600.

The previous prime is 1243377571. The next prime is 1243377607. The reversal of 1243377601 is 1067733421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1052937601 + 190440000 = 32449^2 + 13800^2 .

It is an emirp because it is prime and its reverse (1067733421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1243377601 - 2²⁷ = 1109159873 is a prime.

It is not a weakly prime, because it can be changed into another prime (1243377607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621688800 + 621688801.

It is an arithmetic number, because the mean of its divisors is an integer number (621688801).

Almost surely, 2^1243377601 is an apocalyptic number.

It is an amenable number.

1243377601 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243377601 is an equidigital number, since it uses as much as digits as its factorization.

1243377601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21168, while the sum is 34.

The square root of 1243377601 is about 35261.5598208587. The cubic root of 1243377601 is about 1075.3116387991.

The spelling of 1243377601 in words is "one billion, two hundred forty-three million, three hundred seventy-seven thousand, six hundred one".