81979703 has 12 divisors (see below), whose sum is σ = 90668448. Its totient is φ = 74056320.

The previous prime is 81979691. The next prime is 81979721. The reversal of 81979703 is 30797918.

It is not a de Polignac number, because 81979703 - 2¹⁴ = 81963319 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81979103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2783 + ... + 13103.

It is an arithmetic number, because the mean of its divisors is an integer number (7555704).

Almost surely, 2^81979703 is an apocalyptic number.

81979703 is a deficient number, since it is larger than the sum of its proper divisors (8688745).

81979703 is a wasteful number, since it uses less digits than its factorization.

81979703 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10394 (or 10381 counting only the distinct ones).

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 81979703 is about 9054.2643544354. The cubic root of 81979703 is about 434.4123001146.

The spelling of 81979703 in words is "eighty-one million, nine hundred seventy-nine thousand, seven hundred three".