131551217 has 16 divisors (see below), whose sum is σ = 153538560. Its totient is φ = 110384208.

The previous prime is 131551207. The next prime is 131551223. The reversal of 131551217 is 712155131.

It is a cyclic number.

It is not a de Polignac number, because 131551217 - 2⁴ = 131551201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131551207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83168 + ... + 84734.

It is an arithmetic number, because the mean of its divisors is an integer number (9596160).

Almost surely, 2^131551217 is an apocalyptic number.

It is an amenable number.

131551217 is a deficient number, since it is larger than the sum of its proper divisors (21987343).

131551217 is a wasteful number, since it uses less digits than its factorization.

131551217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1820.

The product of its digits is 1050, while the sum is 26.

The square root of 131551217 is about 11469.5778910996. The cubic root of 131551217 is about 508.5866507270.

The spelling of 131551217 in words is "one hundred thirty-one million, five hundred fifty-one thousand, two hundred seventeen".