81503714 has 4 divisors (see below), whose sum is σ = 122255574. Its totient is φ = 40751856.

The previous prime is 81503713. The next prime is 81503731. The reversal of 81503714 is 41730518.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 41730518 = 2 ⋅20865259.

It can be written as a sum of positive squares in only one way, i.e., 49773025 + 31730689 = 7055^2 + 5633^2 .

It is not an unprimeable number, because it can be changed into a prime (81503713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20375927 + ... + 20375930.

Almost surely, 2^81503714 is an apocalyptic number.

81503714 is a deficient number, since it is larger than the sum of its proper divisors (40751860).

81503714 is a wasteful number, since it uses less digits than its factorization.

81503714 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40751859.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 81503714 is about 9027.9407397258. The cubic root of 81503714 is about 433.5699088210.

The spelling of 81503714 in words is "eighty-one million, five hundred three thousand, seven hundred fourteen".