131220329 has 2 divisors, whose sum is σ = 131220330. Its totient is φ = 131220328.

The previous prime is 131220293. The next prime is 131220361. The reversal of 131220329 is 923022131.

Together with previous prime (131220293) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105616729 + 25603600 = 10277^2 + 5060^2 .

It is a cyclic number.

It is not a de Polignac number, because 131220329 - 2²⁰ = 130171753 is a prime.

It is not a weakly prime, because it can be changed into another prime (131220029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65610164 + 65610165.

It is an arithmetic number, because the mean of its divisors is an integer number (65610165).

Almost surely, 2^131220329 is an apocalyptic number.

It is an amenable number.

131220329 is a deficient number, since it is larger than the sum of its proper divisors (1).

131220329 is an equidigital number, since it uses as much as digits as its factorization.

131220329 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 131220329 is about 11455.1442155915. The cubic root of 131220329 is about 508.1598802879.

The spelling of 131220329 in words is "one hundred thirty-one million, two hundred twenty thousand, three hundred twenty-nine".