197497994 has 4 divisors (see below), whose sum is σ = 296246994. Its totient is φ = 98748996.

The previous prime is 197497991. The next prime is 197497997. The reversal of 197497994 is 499794791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 499794791 = 19 ⋅26304989.

It is an interprime number because it is at equal distance from previous prime (197497991) and next prime (197497997).

It can be written as a sum of positive squares in only one way, i.e., 194239969 + 3258025 = 13937^2 + 1805^2 .

It is not an unprimeable number, because it can be changed into a prime (197497991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49374497 + ... + 49374500.

Almost surely, 2^197497994 is an apocalyptic number.

197497994 is a deficient number, since it is larger than the sum of its proper divisors (98749000).

197497994 is an equidigital number, since it uses as much as digits as its factorization.

197497994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98748999.

The product of its digits is 5143824, while the sum is 59.

The square root of 197497994 is about 14053.3979520969. The cubic root of 197497994 is about 582.3546705911.

The spelling of 197497994 in words is "one hundred ninety-seven million, four hundred ninety-seven thousand, nine hundred ninety-four".