197139231 has 16 divisors (see below), whose sum is σ = 307430400. Its totient is φ = 124508664.

The previous prime is 197139181. The next prime is 197139317. The reversal of 197139231 is 132931791.

It is a happy number.

197139231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-197139231 is a prime.

It is a super-2 number, since 2×197139231² = 77727752798542722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197139031) 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, 191631 + ... + 192656.

It is an arithmetic number, because the mean of its divisors is an integer number (19214400).

Almost surely, 2^197139231 is an apocalyptic number.

197139231 is a deficient number, since it is larger than the sum of its proper divisors (110291169).

197139231 is a wasteful number, since it uses less digits than its factorization.

197139231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384315 (or 384309 counting only the distinct ones).

The product of its digits is 10206, while the sum is 36.

The square root of 197139231 is about 14040.6278705762. The cubic root of 197139231 is about 582.0018333453.

The spelling of 197139231 in words is "one hundred ninety-seven million, one hundred thirty-nine thousand, two hundred thirty-one".