131506819 has 2 divisors, whose sum is σ = 131506820. Its totient is φ = 131506818.

The previous prime is 131506807. The next prime is 131506841. The reversal of 131506819 is 918605131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 131506819 - 2⁵ = 131506787 is a prime.

It is a super-2 number, since 2×131506819² = 34588086886997522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (131506889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65753409 + 65753410.

It is an arithmetic number, because the mean of its divisors is an integer number (65753410).

Almost surely, 2^131506819 is an apocalyptic number.

131506819 is a deficient number, since it is larger than the sum of its proper divisors (1).

131506819 is an equidigital number, since it uses as much as digits as its factorization.

131506819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 131506819 is about 11467.6422598545. The cubic root of 131506819 is about 508.5294289814.

The spelling of 131506819 in words is "one hundred thirty-one million, five hundred six thousand, eight hundred nineteen".