131217229 has 16 divisors (see below), whose sum is σ = 154869120. Its totient is φ = 109604160.

The previous prime is 131217227. The next prime is 131217253. The reversal of 131217229 is 922712131.

It is a cyclic number.

It is not a de Polignac number, because 131217229 - 2¹ = 131217227 is a prime.

It is a super-2 number, since 2×131217229² = 34435922372876882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131217197 and 131217206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131217223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30744 + ... + 34750.

It is an arithmetic number, because the mean of its divisors is an integer number (9679320).

Almost surely, 2^131217229 is an apocalyptic number.

It is an amenable number.

131217229 is a deficient number, since it is larger than the sum of its proper divisors (23651891).

131217229 is a wasteful number, since it uses less digits than its factorization.

131217229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4260.

The product of its digits is 1512, while the sum is 28.

The square root of 131217229 is about 11455.0089044051. The cubic root of 131217229 is about 508.1558786010.

The spelling of 131217229 in words is "one hundred thirty-one million, two hundred seventeen thousand, two hundred twenty-nine".