81549703 has 2 divisors, whose sum is σ = 81549704. Its totient is φ = 81549702.

The previous prime is 81549701. The next prime is 81549733. The reversal of 81549703 is 30794518.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81549703 - 2¹ = 81549701 is a prime.

Together with 81549701, 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 (81549701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40774851 + 40774852.

It is an arithmetic number, because the mean of its divisors is an integer number (40774852).

Almost surely, 2^81549703 is an apocalyptic number.

81549703 is a deficient number, since it is larger than the sum of its proper divisors (1).

81549703 is an equidigital number, since it uses as much as digits as its factorization.

81549703 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 81549703 is about 9030.4874176315. The cubic root of 81549703 is about 433.6514417001.

The spelling of 81549703 in words is "eighty-one million, five hundred forty-nine thousand, seven hundred three".