81671703 has 4 divisors (see below), whose sum is σ = 108895608. Its totient is φ = 54447800.

The previous prime is 81671683. The next prime is 81671729. The reversal of 81671703 is 30717618.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81671703 - 2¹⁰ = 81670679 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81671783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13611948 + ... + 13611953.

It is an arithmetic number, because the mean of its divisors is an integer number (27223902).

Almost surely, 2^81671703 is an apocalyptic number.

81671703 is a deficient number, since it is larger than the sum of its proper divisors (27223905).

81671703 is a wasteful number, since it uses less digits than its factorization.

81671703 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27223904.

The product of its (nonzero) digits is 7056, while the sum is 33.

The square root of 81671703 is about 9037.2397887851. The cubic root of 81671703 is about 433.8675843849.

It can be divided in two parts, 8167 and 1703, that added together give a triangular number (9870 = T₁₄₀).

The spelling of 81671703 in words is "eighty-one million, six hundred seventy-one thousand, seven hundred three".