1245243401 has 2 divisors, whose sum is σ = 1245243402. Its totient is φ = 1245243400.

The previous prime is 1245243397. The next prime is 1245243403. The reversal of 1245243401 is 1043425421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 885003001 + 360240400 = 29749^2 + 18980^2 .

It is an emirp because it is prime and its reverse (1043425421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1245243401 - 2² = 1245243397 is a prime.

It is a super-2 number, since 2×1245243401² = 3101262255468093602, which contains 22 as substring.

Together with 1245243403, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1245243403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622621700 + 622621701.

It is an arithmetic number, because the mean of its divisors is an integer number (622621701).

Almost surely, 2^1245243401 is an apocalyptic number.

It is an amenable number.

1245243401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1245243401 is an equidigital number, since it uses as much as digits as its factorization.

1245243401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 1245243401 is about 35288.0064752885. The cubic root of 1245243401 is about 1075.8492372828.

Adding to 1245243401 its reverse (1043425421), we get a palindrome (2288668822).

The spelling of 1245243401 in words is "one billion, two hundred forty-five million, two hundred forty-three thousand, four hundred one".