131220106 has 16 divisors (see below), whose sum is σ = 207993600. Its totient is φ = 61961328.

The previous prime is 131220101. The next prime is 131220143. The reversal of 131220106 is 601022131.

It is a self number, because there is not a number n which added to its sum of digits gives 131220106.

It is not an unprimeable number, because it can be changed into a prime (131220101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14421 + ... + 21688.

It is an arithmetic number, because the mean of its divisors is an integer number (12999600).

Almost surely, 2^131220106 is an apocalyptic number.

131220106 is a deficient number, since it is larger than the sum of its proper divisors (76773494).

131220106 is a wasteful number, since it uses less digits than its factorization.

131220106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36213.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 131220106 is about 11455.1344819692. The cubic root of 131220106 is about 508.1595924267.

Adding to 131220106 its reverse (601022131), we get a palindrome (732242237).

The spelling of 131220106 in words is "one hundred thirty-one million, two hundred twenty thousand, one hundred six".