1297197731 has 2 divisors, whose sum is σ = 1297197732. Its totient is φ = 1297197730.

The previous prime is 1297197709. The next prime is 1297197739. The reversal of 1297197731 is 1377917921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1297197731 - 2⁶ = 1297197667 is a prime.

It is a super-2 number, since 2×1297197731² = 3365443906623096722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1297197739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 648598865 + 648598866.

It is an arithmetic number, because the mean of its divisors is an integer number (648598866).

Almost surely, 2^1297197731 is an apocalyptic number.

1297197731 is a deficient number, since it is larger than the sum of its proper divisors (1).

1297197731 is an equidigital number, since it uses as much as digits as its factorization.

1297197731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 166698, while the sum is 47.

The square root of 1297197731 is about 36016.6313111040. The cubic root of 1297197731 is about 1090.6081198264.

The spelling of 1297197731 in words is "one billion, two hundred ninety-seven million, one hundred ninety-seven thousand, seven hundred thirty-one".