81646483 has 2 divisors, whose sum is σ = 81646484. Its totient is φ = 81646482.

The previous prime is 81646471. The next prime is 81646489. The reversal of 81646483 is 38464618.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81646483 - 2²¹ = 79549331 is a prime.

It is a super-2 number, since 2×81646483² = 13332296372538578, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (81646489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40823241 + 40823242.

It is an arithmetic number, because the mean of its divisors is an integer number (40823242).

Almost surely, 2^81646483 is an apocalyptic number.

81646483 is a deficient number, since it is larger than the sum of its proper divisors (1).

81646483 is an equidigital number, since it uses as much as digits as its factorization.

81646483 is an evil number, because the sum of its binary digits is even.

The product of its digits is 110592, while the sum is 40.

The square root of 81646483 is about 9035.8443435022. The cubic root of 81646483 is about 433.8229207434.

The spelling of 81646483 in words is "eighty-one million, six hundred forty-six thousand, four hundred eighty-three".