131421065 has 4 divisors (see below), whose sum is σ = 157705284. Its totient is φ = 105136848.

The previous prime is 131421061. The next prime is 131421083. The reversal of 131421065 is 560124131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 560124131 = 7 ⋅80017733.

It can be written as a sum of positive squares in 2 ways, for example, as 23697424 + 107723641 = 4868^2 + 10379^2 .

It is a cyclic number.

It is not a de Polignac number, because 131421065 - 2² = 131421061 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 131421065.

It is not an unprimeable number, because it can be changed into a prime (131421061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13142102 + ... + 13142111.

It is an arithmetic number, because the mean of its divisors is an integer number (39426321).

Almost surely, 2^131421065 is an apocalyptic number.

It is an amenable number.

131421065 is a deficient number, since it is larger than the sum of its proper divisors (26284219).

131421065 is an equidigital number, since it uses as much as digits as its factorization.

131421065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26284218.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 131421065 is about 11463.9026949813. The cubic root of 131421065 is about 508.4188696576.

Adding to 131421065 its reverse (560124131), we get a palindrome (691545196).

The spelling of 131421065 in words is "one hundred thirty-one million, four hundred twenty-one thousand, sixty-five".