197556381 has 32 divisors (see below), whose sum is σ = 330307200. Its totient is φ = 115597440.

The previous prime is 197556341. The next prime is 197556389. The reversal of 197556381 is 183655791.

It is a happy number.

197556381 is a `hidden beast` number, since 1 + 9 + 7 + 5 + 5 + 638 + 1 = 666.

It is not a de Polignac number, because 197556381 - 2¹⁰ = 197555357 is a prime.

It is a super-2 number, since 2×197556381² = 78057047347634322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197556389) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2856 + ... + 20081.

It is an arithmetic number, because the mean of its divisors is an integer number (10322100).

Almost surely, 2^197556381 is an apocalyptic number.

197556381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

197556381 is a deficient number, since it is larger than the sum of its proper divisors (132750819).

197556381 is a wasteful number, since it uses less digits than its factorization.

197556381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22986 (or 22980 counting only the distinct ones).

The product of its digits is 226800, while the sum is 45.

The square root of 197556381 is about 14055.4751253737. The cubic root of 197556381 is about 582.4120527638.

The spelling of 197556381 in words is "one hundred ninety-seven million, five hundred fifty-six thousand, three hundred eighty-one".