131220002 has 4 divisors (see below), whose sum is σ = 196830006. Its totient is φ = 65610000.

The previous prime is 131219989. The next prime is 131220017. The reversal of 131220002 is 200022131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 200022131 = 1087 ⋅184013.

It can be written as a sum of positive squares in only one way, i.e., 65626201 + 65593801 = 8101^2 + 8099^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32804999 + ... + 32805002.

Almost surely, 2^131220002 is an apocalyptic number.

131220002 is a deficient number, since it is larger than the sum of its proper divisors (65610004).

131220002 is an equidigital number, since it uses as much as digits as its factorization.

131220002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65610003.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 131220002 is about 11455.1299425192. The cubic root of 131220002 is about 508.1594581775.

Adding to 131220002 its reverse (200022131), we get a palindrome (331242133).

The spelling of 131220002 in words is "one hundred thirty-one million, two hundred twenty thousand, two".