81746503 has 4 divisors (see below), whose sum is σ = 81935728. Its totient is φ = 81557280.

The previous prime is 81746491. The next prime is 81746507. The reversal of 81746503 is 30564718.

It is a Cunningham number, because it is equal to 434³-1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30564718 = 2 ⋅15282359.

It is a cyclic number.

It is not a de Polignac number, because 81746503 - 2²⁵ = 48192071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81746507) 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, 93963 + ... + 94828.

It is an arithmetic number, because the mean of its divisors is an integer number (20483932).

Almost surely, 2^81746503 is an apocalyptic number.

81746503 is a deficient number, since it is larger than the sum of its proper divisors (189225).

81746503 is a wasteful number, since it uses less digits than its factorization.

81746503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189224.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 81746503 is about 9041.3772734025. The cubic root of 81746503 is about 433.9999982303. Note that the first 5 decimals are identical.

The spelling of 81746503 in words is "eighty-one million, seven hundred forty-six thousand, five hundred three".