131563421 has 6 divisors (see below), whose sum is σ = 144611166. Its totient is φ = 119603000.

The previous prime is 131563417. The next prime is 131563433. The reversal of 131563421 is 124365131.

It can be written as a sum of positive squares in only one way, i.e., 77246521 + 54316900 = 8789^2 + 7370^2 .

It is not a de Polignac number, because 131563421 - 2² = 131563417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131563321) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 543530 + ... + 543771.

It is an arithmetic number, because the mean of its divisors is an integer number (24101861).

Almost surely, 2^131563421 is an apocalyptic number.

131563421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

131563421 is a deficient number, since it is larger than the sum of its proper divisors (13047745).

131563421 is a wasteful number, since it uses less digits than its factorization.

131563421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1087323 (or 1087312 counting only the distinct ones).

The product of its digits is 2160, while the sum is 26.

The square root of 131563421 is about 11470.1098948528. The cubic root of 131563421 is about 508.6023774270.

The spelling of 131563421 in words is "one hundred thirty-one million, five hundred sixty-three thousand, four hundred twenty-one".