197877949 has 2 divisors, whose sum is σ = 197877950. Its totient is φ = 197877948.

The previous prime is 197877941. The next prime is 197877971. The reversal of 197877949 is 949778791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142969849 + 54908100 = 11957^2 + 7410^2 .

It is a cyclic number.

It is not a de Polignac number, because 197877949 - 2³ = 197877941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197877941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98938974 + 98938975.

It is an arithmetic number, because the mean of its divisors is an integer number (98938975).

Almost surely, 2^197877949 is an apocalyptic number.

It is an amenable number.

197877949 is a deficient number, since it is larger than the sum of its proper divisors (1).

197877949 is an equidigital number, since it uses as much as digits as its factorization.

197877949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8001504, while the sum is 61.

The square root of 197877949 is about 14066.9097174895. The cubic root of 197877949 is about 582.7278842131.

The spelling of 197877949 in words is "one hundred ninety-seven million, eight hundred seventy-seven thousand, nine hundred forty-nine".