131780636 has 12 divisors (see below), whose sum is σ = 248355912. Its totient is φ = 60821808.

The previous prime is 131780633. The next prime is 131780647. The reversal of 131780636 is 636087131.

It is a super-2 number, since 2×131780636² = 34732272049128992, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 131780596 and 131780605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131780633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1267070 + ... + 1267173.

It is an arithmetic number, because the mean of its divisors is an integer number (20696326).

Almost surely, 2^131780636 is an apocalyptic number.

It is an amenable number.

131780636 is a deficient number, since it is larger than the sum of its proper divisors (116575276).

131780636 is a wasteful number, since it uses less digits than its factorization.

131780636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2534260 (or 2534258 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 131780636 is about 11479.5747307990. The cubic root of 131780636 is about 508.8821292520.

The spelling of 131780636 in words is "one hundred thirty-one million, seven hundred eighty thousand, six hundred thirty-six".