81347501 has 8 divisors (see below), whose sum is σ = 82064640. Its totient is φ = 80633952.

The previous prime is 81347491. The next prime is 81347507. The reversal of 81347501 is 10574318.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81347501 - 2¹⁰ = 81346477 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 (81347507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62465 + ... + 63753.

It is an arithmetic number, because the mean of its divisors is an integer number (10258080).

Almost surely, 2^81347501 is an apocalyptic number.

It is an amenable number.

81347501 is a deficient number, since it is larger than the sum of its proper divisors (717139).

81347501 is a wasteful number, since it uses less digits than its factorization.

81347501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1795.

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

The square root of 81347501 is about 9019.2849494846. The cubic root of 81347501 is about 433.2927330140.

The spelling of 81347501 in words is "eighty-one million, three hundred forty-seven thousand, five hundred one".