1252440401 has 2 divisors, whose sum is σ = 1252440402. Its totient is φ = 1252440400.

The previous prime is 1252440389. The next prime is 1252440451. The reversal of 1252440401 is 1040442521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 728946001 + 523494400 = 26999^2 + 22880^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1252440401 is a prime.

It is not a weakly prime, because it can be changed into another prime (1252440451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 626220200 + 626220201.

It is an arithmetic number, because the mean of its divisors is an integer number (626220201).

Almost surely, 2^1252440401 is an apocalyptic number.

It is an amenable number.

1252440401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1252440401 is an equidigital number, since it uses as much as digits as its factorization.

1252440401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 1252440401 is about 35389.8347128098. The cubic root of 1252440401 is about 1077.9179139114.

Adding to 1252440401 its reverse (1040442521), we get a palindrome (2292882922).

It can be divided in two parts, 12524 and 40401, that added together give a palindrome (52925).

The spelling of 1252440401 in words is "one billion, two hundred fifty-two million, four hundred forty thousand, four hundred one".