1245523897 has 2 divisors, whose sum is σ = 1245523898. Its totient is φ = 1245523896.

The previous prime is 1245523889. The next prime is 1245523931. The reversal of 1245523897 is 7983255421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1064325376 + 181198521 = 32624^2 + 13461^2 .

It is an emirp because it is prime and its reverse (7983255421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1245523897 - 2³ = 1245523889 is a prime.

It is not a weakly prime, because it can be changed into another prime (1245520897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622761948 + 622761949.

It is an arithmetic number, because the mean of its divisors is an integer number (622761949).

Almost surely, 2^1245523897 is an apocalyptic number.

It is an amenable number.

1245523897 is a deficient number, since it is larger than the sum of its proper divisors (1).

1245523897 is an equidigital number, since it uses as much as digits as its factorization.

1245523897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 604800, while the sum is 46.

The square root of 1245523897 is about 35291.9806329993. The cubic root of 1245523897 is about 1075.9300109832.

The spelling of 1245523897 in words is "one billion, two hundred forty-five million, five hundred twenty-three thousand, eight hundred ninety-seven".