197139631 has 8 divisors (see below), whose sum is σ = 214366880. Its totient is φ = 180207072.

The previous prime is 197139629. The next prime is 197139637. The reversal of 197139631 is 136931791.

197139631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 197139631 - 2¹ = 197139629 is a prime.

It is a super-3 number, since 3×197139631³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197139637) 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, 72276 + ... + 74953.

It is an arithmetic number, because the mean of its divisors is an integer number (26795860).

Almost surely, 2^197139631 is an apocalyptic number.

197139631 is a deficient number, since it is larger than the sum of its proper divisors (17227249).

197139631 is a wasteful number, since it uses less digits than its factorization.

197139631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147345.

The product of its digits is 30618, while the sum is 40.

The square root of 197139631 is about 14040.6421149462. The cubic root of 197139631 is about 582.0022269767.

The spelling of 197139631 in words is "one hundred ninety-seven million, one hundred thirty-nine thousand, six hundred thirty-one".