131961388 has 48 divisors (see below), whose sum is σ = 258207264. Its totient is φ = 58613760.

The previous prime is 131961353. The next prime is 131961407. The reversal of 131961388 is 883169131.

It is a self number, because there is not a number n which added to its sum of digits gives 131961388.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 205548 + ... + 206188.

It is an arithmetic number, because the mean of its divisors is an integer number (5379318).

Almost surely, 2^131961388 is an apocalyptic number.

It is an amenable number.

131961388 is a deficient number, since it is larger than the sum of its proper divisors (126245876).

131961388 is a wasteful number, since it uses less digits than its factorization.

131961388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 802 (or 800 counting only the distinct ones).

The product of its digits is 31104, while the sum is 40.

The square root of 131961388 is about 11487.4447985616. Note that the first 3 decimals coincide. The cubic root of 131961388 is about 509.1146860300.

The spelling of 131961388 in words is "one hundred thirty-one million, nine hundred sixty-one thousand, three hundred eighty-eight".