231545355221197 has 2 divisors, whose sum is σ = 231545355221198. Its totient is φ = 231545355221196.

The previous prime is 231545355220961. The next prime is 231545355221233. The reversal of 231545355221197 is 791122553545132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155494066515076 + 76051288706121 = 12469726^2 + 8720739^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231545355221197 is a prime.

It is a super-2 number, since 2×231545355221197² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231545355521197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115772677610598 + 115772677610599.

It is an arithmetic number, because the mean of its divisors is an integer number (115772677610599).

Almost surely, 2^{231545355221197} is an apocalyptic number.

It is an amenable number.

231545355221197 is a deficient number, since it is larger than the sum of its proper divisors (1).

231545355221197 is an equidigital number, since it uses as much as digits as its factorization.

231545355221197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340000, while the sum is 55.

The spelling of 231545355221197 in words is "two hundred thirty-one trillion, five hundred forty-five billion, three hundred fifty-five million, two hundred twenty-one thousand, one hundred ninety-seven".