197898731 has 2 divisors, whose sum is σ = 197898732. Its totient is φ = 197898730.

The previous prime is 197898719. The next prime is 197898791. The reversal of 197898731 is 137898791.

It is a weak prime.

It is an emirp because it is prime and its reverse (137898791) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197898731 is a prime.

It is a super-2 number, since 2×197898731² = 78327815462820722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (197898791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98949365 + 98949366.

It is an arithmetic number, because the mean of its divisors is an integer number (98949366).

Almost surely, 2^197898731 is an apocalyptic number.

197898731 is a deficient number, since it is larger than the sum of its proper divisors (1).

197898731 is an equidigital number, since it uses as much as digits as its factorization.

197898731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 762048, while the sum is 53.

The square root of 197898731 is about 14067.6483820147. The cubic root of 197898731 is about 582.7482837018.

The spelling of 197898731 in words is "one hundred ninety-seven million, eight hundred ninety-eight thousand, seven hundred thirty-one".