131521429 has 16 divisors (see below), whose sum is σ = 150240384. Its totient is φ = 114206400.

The previous prime is 131521393. The next prime is 131521433. The reversal of 131521429 is 924125131.

It is a cyclic number.

It is not a de Polignac number, because 131521429 - 2¹³ = 131513237 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131521397 and 131521406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131501429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14634 + ... + 21844.

It is an arithmetic number, because the mean of its divisors is an integer number (9390024).

Almost surely, 2^131521429 is an apocalyptic number.

It is an amenable number.

131521429 is a deficient number, since it is larger than the sum of its proper divisors (18718955).

131521429 is a wasteful number, since it uses less digits than its factorization.

131521429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7308.

The product of its digits is 2160, while the sum is 28.

The square root of 131521429 is about 11468.2792519192. The cubic root of 131521429 is about 508.5482602985.

The spelling of 131521429 in words is "one hundred thirty-one million, five hundred twenty-one thousand, four hundred twenty-nine".