131201388 has 18 divisors (see below), whose sum is σ = 331648044. Its totient is φ = 43733784.

The previous prime is 131201387. The next prime is 131201401. The reversal of 131201388 is 883102131.

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (131201387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1822206 + ... + 1822277.

Almost surely, 2^131201388 is an apocalyptic number.

131201388 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

131201388 is an abundant number, since it is smaller than the sum of its proper divisors (200446656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131201388 is a wasteful number, since it uses less digits than its factorization.

131201388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3644493 (or 3644488 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 131201388 is about 11454.3174392890. The cubic root of 131201388 is about 508.1354289967.

The spelling of 131201388 in words is "one hundred thirty-one million, two hundred one thousand, three hundred eighty-eight".