197985501 has 12 divisors (see below), whose sum is σ = 326833312. Its totient is φ = 113134536.

The previous prime is 197985497. The next prime is 197985509. The reversal of 197985501 is 105589791.

197985501 is a `hidden beast` number, since 1 + 9 + 7 + 98 + 550 + 1 = 666.

It is not a de Polignac number, because 197985501 - 2² = 197985497 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197985509) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1571251 + ... + 1571376.

Almost surely, 2^197985501 is an apocalyptic number.

It is an amenable number.

197985501 is a deficient number, since it is larger than the sum of its proper divisors (128847811).

197985501 is a wasteful number, since it uses less digits than its factorization.

197985501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3142640 (or 3142637 counting only the distinct ones).

The product of its (nonzero) digits is 113400, while the sum is 45.

The square root of 197985501 is about 14070.7320705072. The cubic root of 197985501 is about 582.8334411961.

The spelling of 197985501 in words is "one hundred ninety-seven million, nine hundred eighty-five thousand, five hundred one".