81703124 has 6 divisors (see below), whose sum is σ = 142980474. Its totient is φ = 40851560.

The previous prime is 81703117. The next prime is 81703129. The reversal of 81703124 is 42130718.

It can be written as a sum of positive squares in only one way, i.e., 77123524 + 4579600 = 8782^2 + 2140^2 .

It is a junction number, because it is equal to n+sod(n) for n = 81703093 and 81703102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81703129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10212887 + ... + 10212894.

It is an arithmetic number, because the mean of its divisors is an integer number (23830079).

Almost surely, 2^81703124 is an apocalyptic number.

It is an amenable number.

81703124 is a deficient number, since it is larger than the sum of its proper divisors (61277350).

81703124 is a wasteful number, since it uses less digits than its factorization.

81703124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20425785 (or 20425783 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 81703124 is about 9038.9780395795. The cubic root of 81703124 is about 433.9232168948.

The spelling of 81703124 in words is "eighty-one million, seven hundred three thousand, one hundred twenty-four".