81612703 has 2 divisors, whose sum is σ = 81612704. Its totient is φ = 81612702.

The previous prime is 81612697. The next prime is 81612721. The reversal of 81612703 is 30721618.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81612703 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81612203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40806351 + 40806352.

It is an arithmetic number, because the mean of its divisors is an integer number (40806352).

Almost surely, 2^81612703 is an apocalyptic number.

81612703 is a deficient number, since it is larger than the sum of its proper divisors (1).

81612703 is an equidigital number, since it uses as much as digits as its factorization.

81612703 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 81612703 is about 9033.9749280148. The cubic root of 81612703 is about 433.7630832619.

The spelling of 81612703 in words is "eighty-one million, six hundred twelve thousand, seven hundred three".