81462973 has 2 divisors, whose sum is σ = 81462974. Its totient is φ = 81462972.

The previous prime is 81462971. The next prime is 81462989. The reversal of 81462973 is 37926418.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74183769 + 7279204 = 8613^2 + 2698^2 .

It is a cyclic number.

It is not a de Polignac number, because 81462973 - 2¹ = 81462971 is a prime.

Together with 81462971, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81462971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40731486 + 40731487.

It is an arithmetic number, because the mean of its divisors is an integer number (40731487).

Almost surely, 2^81462973 is an apocalyptic number.

It is an amenable number.

81462973 is a deficient number, since it is larger than the sum of its proper divisors (1).

81462973 is an equidigital number, since it uses as much as digits as its factorization.

81462973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 40.

The square root of 81462973 is about 9025.6840737974. The cubic root of 81462973 is about 433.4976543807.

The spelling of 81462973 in words is "eighty-one million, four hundred sixty-two thousand, nine hundred seventy-three".