1245523421 has 2 divisors, whose sum is σ = 1245523422. Its totient is φ = 1245523420.

The previous prime is 1245523399. The next prime is 1245523429. The reversal of 1245523421 is 1243255421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 659205625 + 586317796 = 25675^2 + 24214^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1245523421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1245523429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622761710 + 622761711.

It is an arithmetic number, because the mean of its divisors is an integer number (622761711).

Almost surely, 2^1245523421 is an apocalyptic number.

It is an amenable number.

1245523421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1245523421 is an equidigital number, since it uses as much as digits as its factorization.

1245523421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9600, while the sum is 29.

The square root of 1245523421 is about 35291.9738892570. The cubic root of 1245523421 is about 1075.9298739210.

Adding to 1245523421 its reverse (1243255421), we get a palindrome (2488778842).

The spelling of 1245523421 in words is "one billion, two hundred forty-five million, five hundred twenty-three thousand, four hundred twenty-one".