197220781 has 8 divisors (see below), whose sum is σ = 199477728. Its totient is φ = 194970000.

The previous prime is 197220763. The next prime is 197220797. The reversal of 197220781 is 187022791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 197220781 - 2²³ = 188832173 is a prime.

It is a super-2 number, since 2×197220781² = 77792072916499922, which contains 22 as substring.

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 197220781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197220761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97066 + ... + 99076.

It is an arithmetic number, because the mean of its divisors is an integer number (24934716).

Almost surely, 2^197220781 is an apocalyptic number.

It is an amenable number.

197220781 is a deficient number, since it is larger than the sum of its proper divisors (2256947).

197220781 is a wasteful number, since it uses less digits than its factorization.

197220781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3083.

The product of its (nonzero) digits is 14112, while the sum is 37.

The square root of 197220781 is about 14043.5316427172. The cubic root of 197220781 is about 582.0820739384.

The spelling of 197220781 in words is "one hundred ninety-seven million, two hundred twenty thousand, seven hundred eighty-one".