197512813397 has 2 divisors, whose sum is σ = 197512813398. Its totient is φ = 197512813396.

The previous prime is 197512813373. The next prime is 197512813403. The reversal of 197512813397 is 793318215791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101384291281 + 96128522116 = 318409^2 + 310046^2 .

It is an emirp because it is prime and its reverse (793318215791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 197512813397 - 2¹⁰ = 197512812373 is a prime.

It is a super-2 number, since 2×197512813397² (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 (197512813357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98756406698 + 98756406699.

It is an arithmetic number, because the mean of its divisors is an integer number (98756406699).

Almost surely, 2^197512813397 is an apocalyptic number.

It is an amenable number.

197512813397 is a deficient number, since it is larger than the sum of its proper divisors (1).

197512813397 is an equidigital number, since it uses as much as digits as its factorization.

197512813397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2857680, while the sum is 56.

The spelling of 197512813397 in words is "one hundred ninety-seven billion, five hundred twelve million, eight hundred thirteen thousand, three hundred ninety-seven".