131442421 has 6 divisors (see below), whose sum is σ = 144478166. Its totient is φ = 119493000.

The previous prime is 131442349. The next prime is 131442427. The reversal of 131442421 is 124244131.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 76475025 + 54967396 = 8745^2 + 7414^2 .

It is not a de Polignac number, because 131442421 - 2¹¹ = 131440373 is a prime.

It is a super-2 number, since 2×131442421² = 34554220076682482, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131442392 and 131442401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131442427) 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, 543030 + ... + 543271.

Almost surely, 2^131442421 is an apocalyptic number.

131442421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

131442421 is a deficient number, since it is larger than the sum of its proper divisors (13035745).

131442421 is a wasteful number, since it uses less digits than its factorization.

131442421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1086323 (or 1086312 counting only the distinct ones).

The product of its digits is 768, while the sum is 22.

The square root of 131442421 is about 11464.8341025939. The cubic root of 131442421 is about 508.4464076207.

Adding to 131442421 its reverse (124244131), we get a palindrome (255686552).

The spelling of 131442421 in words is "one hundred thirty-one million, four hundred forty-two thousand, four hundred twenty-one".