131421309 has 8 divisors (see below), whose sum is σ = 184451040. Its totient is φ = 83002896.

The previous prime is 131421293. The next prime is 131421313. The reversal of 131421309 is 903124131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 131421309 - 2⁴ = 131421293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131421349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1152762 + ... + 1152875.

It is an arithmetic number, because the mean of its divisors is an integer number (23056380).

Almost surely, 2^131421309 is an apocalyptic number.

131421309 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

131421309 is a deficient number, since it is larger than the sum of its proper divisors (53029731).

131421309 is a wasteful number, since it uses less digits than its factorization.

131421309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2305659.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 131421309 is about 11463.9133370765. The cubic root of 131421309 is about 508.4191843056.

The spelling of 131421309 in words is "one hundred thirty-one million, four hundred twenty-one thousand, three hundred nine".