197970091 has 16 divisors (see below), whose sum is σ = 222540768. Its totient is φ = 174528000.

The previous prime is 197970089. The next prime is 197970109. The reversal of 197970091 is 190079791.

It is a cyclic number.

It is not a de Polignac number, because 197970091 - 2¹ = 197970089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197973091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 162601 + ... + 163813.

It is an arithmetic number, because the mean of its divisors is an integer number (13908798).

Almost surely, 2^197970091 is an apocalyptic number.

197970091 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

197970091 is a deficient number, since it is larger than the sum of its proper divisors (24570677).

197970091 is a wasteful number, since it uses less digits than its factorization.

197970091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1662.

The product of its (nonzero) digits is 35721, while the sum is 43.

The square root of 197970091 is about 14070.1844692953. The cubic root of 197970091 is about 582.8183193879.

It can be divided in two parts, 1979700 and 91, that added together give a palindrome (1979791).

The spelling of 197970091 in words is "one hundred ninety-seven million, nine hundred seventy thousand, ninety-one".