131004421 has 2 divisors, whose sum is σ = 131004422. Its totient is φ = 131004420.

The previous prime is 131004337. The next prime is 131004427. The reversal of 131004421 is 124400131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129072321 + 1932100 = 11361^2 + 1390^2 .

It is an emirp because it is prime and its reverse (124400131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131004421 - 2⁹ = 131003909 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 131004395 and 131004404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131004427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65502210 + 65502211.

It is an arithmetic number, because the mean of its divisors is an integer number (65502211).

Almost surely, 2^131004421 is an apocalyptic number.

It is an amenable number.

131004421 is a deficient number, since it is larger than the sum of its proper divisors (1).

131004421 is an equidigital number, since it uses as much as digits as its factorization.

131004421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 131004421 is about 11445.7162729119. The cubic root of 131004421 is about 507.8810210231.

Adding to 131004421 its reverse (124400131), we get a palindrome (255404552).

The spelling of 131004421 in words is "one hundred thirty-one million, four thousand, four hundred twenty-one".