131522217 has 16 divisors (see below), whose sum is σ = 187024320. Its totient is φ = 81925632.

The previous prime is 131522213. The next prime is 131522227. The reversal of 131522217 is 712225131.

It is not a de Polignac number, because 131522217 - 2² = 131522213 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131522213) 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, 2188 + ... + 16365.

It is an arithmetic number, because the mean of its divisors is an integer number (11689020).

Almost surely, 2^131522217 is an apocalyptic number.

131522217 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

131522217 is a deficient number, since it is larger than the sum of its proper divisors (55502103).

131522217 is a wasteful number, since it uses less digits than its factorization.

131522217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18712.

The product of its digits is 840, while the sum is 24.

The square root of 131522217 is about 11468.3136075013. The cubic root of 131522217 is about 508.5492759384.

Adding to 131522217 its reverse (712225131), we get a palindrome (843747348).

It can be divided in two parts, 1315 and 22217, that added together give a palindrome (23532).

The spelling of 131522217 in words is "one hundred thirty-one million, five hundred twenty-two thousand, two hundred seventeen".