131220004 has 24 divisors (see below), whose sum is σ = 247348640. Its totient is φ = 60709824.

The previous prime is 131219989. The next prime is 131220017. The reversal of 131220004 is 400022131.

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 in 7 ways as a sum of consecutive naturals, for example, 16809 + ... + 23344.

Almost surely, 2^131220004 is an apocalyptic number.

It is an amenable number.

131220004 is a deficient number, since it is larger than the sum of its proper divisors (116128636).

131220004 is a wasteful number, since it uses less digits than its factorization.

131220004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40219 (or 40217 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 131220004 is about 11455.1300298163. The cubic root of 131220004 is about 508.1594607592.

Adding to 131220004 its reverse (400022131), we get a palindrome (531242135).

It can be divided in two parts, 1312 and 20004, that added together give a square (21316 = 146²).

The spelling of 131220004 in words is "one hundred thirty-one million, two hundred twenty thousand, four".