131521433 has 2 divisors, whose sum is σ = 131521434. Its totient is φ = 131521432.

The previous prime is 131521393. The next prime is 131521451. The reversal of 131521433 is 334125131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110103049 + 21418384 = 10493^2 + 4628^2 .

It is a cyclic number.

It is not a de Polignac number, because 131521433 - 2¹⁶ = 131455897 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 131521399 and 131521408.

It is not a weakly prime, because it can be changed into another prime (131521483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65760716 + 65760717.

It is an arithmetic number, because the mean of its divisors is an integer number (65760717).

Almost surely, 2^131521433 is an apocalyptic number.

It is an amenable number.

131521433 is a deficient number, since it is larger than the sum of its proper divisors (1).

131521433 is an equidigital number, since it uses as much as digits as its factorization.

131521433 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 23.

The square root of 131521433 is about 11468.2794263133. The cubic root of 131521433 is about 508.5482654540.

Adding to 131521433 its reverse (334125131), we get a palindrome (465646564).

The spelling of 131521433 in words is "one hundred thirty-one million, five hundred twenty-one thousand, four hundred thirty-three".