188431189397 has 12 divisors (see below), whose sum is σ = 207129271020. Its totient is φ = 171292239360.

The previous prime is 188431189343. The next prime is 188431189451. The reversal of 188431189397 is 793981134881.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (188431189343) and next prime (188431189451).

It can be written as a sum of positive squares in 2 ways, for example, as 4965457156 + 183465732241 = 70466^2 + 428329^2 .

It is not a de Polignac number, because 188431189397 - 2⁶ = 188431189333 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 (188431188397) 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, 3917429 + ... + 3965237.

It is an arithmetic number, because the mean of its divisors is an integer number (17260772585).

Almost surely, 2^188431189397 is an apocalyptic number.

It is an amenable number.

188431189397 is a deficient number, since it is larger than the sum of its proper divisors (18698081623).

188431189397 is a wasteful number, since it uses less digits than its factorization.

188431189397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80404 (or 80393 counting only the distinct ones).

The product of its digits is 10450944, while the sum is 62.

The spelling of 188431189397 in words is "one hundred eighty-eight billion, four hundred thirty-one million, one hundred eighty-nine thousand, three hundred ninety-seven".