197932254781 has 2 divisors, whose sum is σ = 197932254782. Its totient is φ = 197932254780.

The previous prime is 197932254703. The next prime is 197932254797. The reversal of 197932254781 is 187452239791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 176664699225 + 21267555556 = 420315^2 + 145834^2 .

It is an emirp because it is prime and its reverse (187452239791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 197932254781 - 2²⁹ = 197395383869 is a prime.

It is a super-2 number, since 2×197932254781² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197932254581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98966127390 + 98966127391.

It is an arithmetic number, because the mean of its divisors is an integer number (98966127391).

Almost surely, 2^197932254781 is an apocalyptic number.

It is an amenable number.

197932254781 is a deficient number, since it is larger than the sum of its proper divisors (1).

197932254781 is an equidigital number, since it uses as much as digits as its factorization.

197932254781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7620480, while the sum is 58.

The spelling of 197932254781 in words is "one hundred ninety-seven billion, nine hundred thirty-two million, two hundred fifty-four thousand, seven hundred eighty-one".