1245431797 has 2 divisors, whose sum is σ = 1245431798. Its totient is φ = 1245431796.

The previous prime is 1245431773. The next prime is 1245431809. The reversal of 1245431797 is 7971345421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 651729841 + 593701956 = 25529^2 + 24366^2 .

It is a cyclic number.

It is not a de Polignac number, because 1245431797 - 2¹⁹ = 1244907509 is a prime.

It is a super-2 number, since 2×1245431797² = 3102200721957298418, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1245431717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622715898 + 622715899.

It is an arithmetic number, because the mean of its divisors is an integer number (622715899).

Almost surely, 2^1245431797 is an apocalyptic number.

It is an amenable number.

1245431797 is a deficient number, since it is larger than the sum of its proper divisors (1).

1245431797 is an equidigital number, since it uses as much as digits as its factorization.

1245431797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 211680, while the sum is 43.

The square root of 1245431797 is about 35290.6757798714. The cubic root of 1245431797 is about 1075.9034905241.

The spelling of 1245431797 in words is "one billion, two hundred forty-five million, four hundred thirty-one thousand, seven hundred ninety-seven".