131906236 has 72 divisors (see below), whose sum is σ = 295381296. Its totient is φ = 50964480.

The previous prime is 131906233. The next prime is 131906237. The reversal of 131906236 is 632609131.

It is a junction number, because it is equal to n+sod(n) for n = 131906198 and 131906207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131906231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 415950 + ... + 416266.

It is an arithmetic number, because the mean of its divisors is an integer number (4102518).

Almost surely, 2^131906236 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131906236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (147690648).

131906236 is an abundant number, since it is smaller than the sum of its proper divisors (163475060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131906236 is a wasteful number, since it uses less digits than its factorization.

131906236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539 (or 530 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 131906236 is about 11485.0440138469. The cubic root of 131906236 is about 509.0437496088.

The spelling of 131906236 in words is "one hundred thirty-one million, nine hundred six thousand, two hundred thirty-six".