81247363 has 8 divisors (see below), whose sum is σ = 87610320. Its totient is φ = 75093120.

The previous prime is 81247291. The next prime is 81247381. The reversal of 81247363 is 36374218.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81247363 is a prime.

It is a super-2 number, since 2×81247363² = 13202267988907538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81247393) 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, 51370 + ... + 52927.

It is an arithmetic number, because the mean of its divisors is an integer number (10951290).

Almost surely, 2^81247363 is an apocalyptic number.

81247363 is a deficient number, since it is larger than the sum of its proper divisors (6362957).

81247363 is a wasteful number, since it uses less digits than its factorization.

81247363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104357.

The product of its digits is 24192, while the sum is 34.

The square root of 81247363 is about 9013.7319130314. The cubic root of 81247363 is about 433.1148669325.

The spelling of 81247363 in words is "eighty-one million, two hundred forty-seven thousand, three hundred sixty-three".