81486623 has 2 divisors, whose sum is σ = 81486624. Its totient is φ = 81486622.

The previous prime is 81486589. The next prime is 81486637. The reversal of 81486623 is 32668418.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81486623 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81486023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40743311 + 40743312.

It is an arithmetic number, because the mean of its divisors is an integer number (40743312).

Almost surely, 2^81486623 is an apocalyptic number.

81486623 is a deficient number, since it is larger than the sum of its proper divisors (1).

81486623 is an equidigital number, since it uses as much as digits as its factorization.

81486623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55296, while the sum is 38.

The square root of 81486623 is about 9026.9941287230. The cubic root of 81486623 is about 433.5396007488.

The spelling of 81486623 in words is "eighty-one million, four hundred eighty-six thousand, six hundred twenty-three".