81341787 has 8 divisors (see below), whose sum is σ = 114835536. Its totient is φ = 51037952.

The previous prime is 81341761. The next prime is 81341791. The reversal of 81341787 is 78714318.

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 81341787 - 2⁸ = 81341531 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81341747) 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, 797418 + ... + 797519.

It is an arithmetic number, because the mean of its divisors is an integer number (14354442).

Almost surely, 2^81341787 is an apocalyptic number.

81341787 is a deficient number, since it is larger than the sum of its proper divisors (33493749).

81341787 is a wasteful number, since it uses less digits than its factorization.

81341787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1594957.

The product of its digits is 37632, while the sum is 39.

The square root of 81341787 is about 9018.9681782341. The cubic root of 81341787 is about 433.2825876803.

It can be divided in two parts, 81341 and 787, that added together give a palindrome (82128).

The spelling of 81341787 in words is "eighty-one million, three hundred forty-one thousand, seven hundred eighty-seven".