197977901 has 6 divisors (see below), whose sum is σ = 217612206. Its totient is φ = 179979800.

The previous prime is 197977883. The next prime is 197977907. The reversal of 197977901 is 109779791.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 186349801 + 11628100 = 13651^2 + 3410^2 .

It is not a de Polignac number, because 197977901 - 2⁶ = 197977837 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 197977901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197977907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 817970 + ... + 818211.

It is an arithmetic number, because the mean of its divisors is an integer number (36268701).

Almost surely, 2^197977901 is an apocalyptic number.

197977901 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

197977901 is a deficient number, since it is larger than the sum of its proper divisors (19634305).

197977901 is a wasteful number, since it uses less digits than its factorization.

197977901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1636203 (or 1636192 counting only the distinct ones).

The product of its (nonzero) digits is 250047, while the sum is 50.

The square root of 197977901 is about 14070.4620037865. The cubic root of 197977901 is about 582.8259834264.

The spelling of 197977901 in words is "one hundred ninety-seven million, nine hundred seventy-seven thousand, nine hundred one".