197357981 has 8 divisors (see below), whose sum is σ = 211486464. Its totient is φ = 183509440.

The previous prime is 197357971. The next prime is 197357987. The reversal of 197357981 is 189753791.

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 197357981 - 2¹⁸ = 197095837 is a prime.

It is a super-2 number, since 2×197357981² = 77900345328792722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197357987) 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, 68525 + ... + 71346.

It is an arithmetic number, because the mean of its divisors is an integer number (26435808).

Almost surely, 2^197357981 is an apocalyptic number.

It is an amenable number.

197357981 is a deficient number, since it is larger than the sum of its proper divisors (14128483).

197357981 is a wasteful number, since it uses less digits than its factorization.

197357981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139971.

The product of its digits is 476280, while the sum is 50.

The square root of 197357981 is about 14048.4156046153. The cubic root of 197357981 is about 582.2170210913.

The spelling of 197357981 in words is "one hundred ninety-seven million, three hundred fifty-seven thousand, nine hundred eighty-one".