197894513 has 2 divisors, whose sum is σ = 197894514. Its totient is φ = 197894512.

The previous prime is 197894509. The next prime is 197894533. The reversal of 197894513 is 315498791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 154952704 + 42941809 = 12448^2 + 6553^2 .

It is an emirp because it is prime and its reverse (315498791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 197894513 - 2² = 197894509 is a prime.

It is not a weakly prime, because it can be changed into another prime (197894503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98947256 + 98947257.

It is an arithmetic number, because the mean of its divisors is an integer number (98947257).

Almost surely, 2^197894513 is an apocalyptic number.

It is an amenable number.

197894513 is a deficient number, since it is larger than the sum of its proper divisors (1).

197894513 is an equidigital number, since it uses as much as digits as its factorization.

197894513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 47.

The square root of 197894513 is about 14067.4984627687. The cubic root of 197894513 is about 582.7441434534.

The spelling of 197894513 in words is "one hundred ninety-seven million, eight hundred ninety-four thousand, five hundred thirteen".