1231431120197 has 2 divisors, whose sum is σ = 1231431120198. Its totient is φ = 1231431120196.

The previous prime is 1231431120173. The next prime is 1231431120299. The reversal of 1231431120197 is 7910211341321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1074386148676 + 157044971521 = 1036526^2 + 396289^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231431120197 - 2²² = 1231426925893 is a prime.

It is a super-2 number, since 2×1231431120197² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231431120167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615715560098 + 615715560099.

It is an arithmetic number, because the mean of its divisors is an integer number (615715560099).

Almost surely, 2^{1231431120197} is an apocalyptic number.

It is an amenable number.

1231431120197 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231431120197 is an equidigital number, since it uses as much as digits as its factorization.

1231431120197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 35.

The spelling of 1231431120197 in words is "one trillion, two hundred thirty-one billion, four hundred thirty-one million, one hundred twenty thousand, one hundred ninety-seven".