81613703 has 2 divisors, whose sum is σ = 81613704. Its totient is φ = 81613702.

The previous prime is 81613673. The next prime is 81613709. The reversal of 81613703 is 30731618.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81613703 - 2⁶ = 81613639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81613709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40806851 + 40806852.

It is an arithmetic number, because the mean of its divisors is an integer number (40806852).

Almost surely, 2^81613703 is an apocalyptic number.

81613703 is a deficient number, since it is larger than the sum of its proper divisors (1).

81613703 is an equidigital number, since it uses as much as digits as its factorization.

81613703 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 81613703 is about 9034.0302744678. The cubic root of 81613703 is about 433.7648548869.

The spelling of 81613703 in words is "eighty-one million, six hundred thirteen thousand, seven hundred three".