131621755 has 8 divisors (see below), whose sum is σ = 164813472. Its totient is φ = 100719168.

The previous prime is 131621747. The next prime is 131621771. The reversal of 131621755 is 557126131.

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 131621755 - 2³ = 131621747 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 572154 + ... + 572383.

It is an arithmetic number, because the mean of its divisors is an integer number (20601684).

Almost surely, 2^131621755 is an apocalyptic number.

131621755 is a deficient number, since it is larger than the sum of its proper divisors (33191717).

131621755 is a wasteful number, since it uses less digits than its factorization.

131621755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1144565.

The product of its digits is 6300, while the sum is 31.

The square root of 131621755 is about 11472.6524831880. The cubic root of 131621755 is about 508.6775361780.

Adding to 131621755 its reverse (557126131), we get a palindrome (688747886).

The spelling of 131621755 in words is "one hundred thirty-one million, six hundred twenty-one thousand, seven hundred fifty-five".