197315381 has 2 divisors, whose sum is σ = 197315382. Its totient is φ = 197315380.

The previous prime is 197315357. The next prime is 197315387. The reversal of 197315381 is 183513791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 183846481 + 13468900 = 13559^2 + 3670^2 .

It is a cyclic number.

It is not a de Polignac number, because 197315381 - 2¹⁰ = 197314357 is a prime.

It is a super-2 number, since 2×197315381² = 77866719158350322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197315387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98657690 + 98657691.

It is an arithmetic number, because the mean of its divisors is an integer number (98657691).

Almost surely, 2^197315381 is an apocalyptic number.

It is an amenable number.

197315381 is a deficient number, since it is larger than the sum of its proper divisors (1).

197315381 is an equidigital number, since it uses as much as digits as its factorization.

197315381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 38.

The square root of 197315381 is about 14046.8993375762. The cubic root of 197315381 is about 582.1751272871.

The spelling of 197315381 in words is "one hundred ninety-seven million, three hundred fifteen thousand, three hundred eighty-one".