81523067 has 2 divisors, whose sum is σ = 81523068. Its totient is φ = 81523066.

The previous prime is 81523037. The next prime is 81523069. The reversal of 81523067 is 76032518.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81523067 - 2¹⁰ = 81522043 is a prime.

Together with 81523069, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81523069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40761533 + 40761534.

It is an arithmetic number, because the mean of its divisors is an integer number (40761534).

Almost surely, 2^81523067 is an apocalyptic number.

81523067 is a deficient number, since it is larger than the sum of its proper divisors (1).

81523067 is an equidigital number, since it uses as much as digits as its factorization.

81523067 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 81523067 is about 9029.0125152200. The cubic root of 81523067 is about 433.6042230626.

The spelling of 81523067 in words is "eighty-one million, five hundred twenty-three thousand, sixty-seven".