131959221 has 16 divisors (see below), whose sum is σ = 180378624. Its totient is φ = 85770864.

The previous prime is 131959213. The next prime is 131959229. The reversal of 131959221 is 122959131.

It is an interprime number because it is at equal distance from previous prime (131959213) and next prime (131959229).

It is not a de Polignac number, because 131959221 - 2³ = 131959213 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131959229) 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 15 ways as a sum of consecutive naturals, for example, 38250 + ... + 41556.

It is an arithmetic number, because the mean of its divisors is an integer number (11273664).

Almost surely, 2^131959221 is an apocalyptic number.

It is an amenable number.

131959221 is a deficient number, since it is larger than the sum of its proper divisors (48419403).

131959221 is a wasteful number, since it uses less digits than its factorization.

131959221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3640.

The product of its digits is 4860, while the sum is 33.

The square root of 131959221 is about 11487.3504778082. The cubic root of 131959221 is about 509.1118992109. Note that the first 3 decimals are identical.

The spelling of 131959221 in words is "one hundred thirty-one million, nine hundred fifty-nine thousand, two hundred twenty-one".