131545391 has 2 divisors, whose sum is σ = 131545392. Its totient is φ = 131545390.

The previous prime is 131545387. The next prime is 131545409. The reversal of 131545391 is 193545131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 131545391 - 2² = 131545387 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131545301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65772695 + 65772696.

It is an arithmetic number, because the mean of its divisors is an integer number (65772696).

Almost surely, 2^131545391 is an apocalyptic number.

131545391 is a deficient number, since it is larger than the sum of its proper divisors (1).

131545391 is an equidigital number, since it uses as much as digits as its factorization.

131545391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8100, while the sum is 32.

The square root of 131545391 is about 11469.3239120708. The cubic root of 131545391 is about 508.5791427018.

The spelling of 131545391 in words is "one hundred thirty-one million, five hundred forty-five thousand, three hundred ninety-one".