1297531847 has 2 divisors, whose sum is σ = 1297531848. Its totient is φ = 1297531846.

The previous prime is 1297531843. The next prime is 1297531861. The reversal of 1297531847 is 7481357921.

It is a weak prime.

It is an emirp because it is prime and its reverse (7481357921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1297531847 - 2² = 1297531843 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1297531843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 648765923 + 648765924.

It is an arithmetic number, because the mean of its divisors is an integer number (648765924).

Almost surely, 2^1297531847 is an apocalyptic number.

1297531847 is a deficient number, since it is larger than the sum of its proper divisors (1).

1297531847 is an equidigital number, since it uses as much as digits as its factorization.

1297531847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 423360, while the sum is 47.

The square root of 1297531847 is about 36021.2693696377. The cubic root of 1297531847 is about 1090.7017468640.

The spelling of 1297531847 in words is "one billion, two hundred ninety-seven million, five hundred thirty-one thousand, eight hundred forty-seven".