1320717457 has 2 divisors, whose sum is σ = 1320717458. Its totient is φ = 1320717456.

The previous prime is 1320717413. The next prime is 1320717469. The reversal of 1320717457 is 7547170231.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1316891521 + 3825936 = 36289^2 + 1956^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320717457 - 2¹⁵ = 1320684689 is a prime.

It is a super-4 number, since 4×1320717457⁴ (a number of 38 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (1320717407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660358728 + 660358729.

It is an arithmetic number, because the mean of its divisors is an integer number (660358729).

Almost surely, 2^1320717457 is an apocalyptic number.

It is an amenable number.

1320717457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320717457 is an equidigital number, since it uses as much as digits as its factorization.

1320717457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41160, while the sum is 37.

The square root of 1320717457 is about 36341.6765848798. The cubic root of 1320717457 is about 1097.1600175634.

Adding to 1320717457 its reverse (7547170231), we get a palindrome (8867887688).

The spelling of 1320717457 in words is "one billion, three hundred twenty million, seven hundred seventeen thousand, four hundred fifty-seven".