81742211 has 8 divisors (see below), whose sum is σ = 83349504. Its totient is φ = 80146440.

The previous prime is 81742201. The next prime is 81742223. The reversal of 81742211 is 11224718.

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 81742211 - 2¹⁸ = 81480067 is a prime.

It is a super-3 number, since 3×81742211³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81742201) 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, 12206 + ... + 17676.

It is an arithmetic number, because the mean of its divisors is an integer number (10418688).

Almost surely, 2^81742211 is an apocalyptic number.

81742211 is a deficient number, since it is larger than the sum of its proper divisors (1607293).

81742211 is a wasteful number, since it uses less digits than its factorization.

81742211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5761.

The product of its digits is 896, while the sum is 26.

The square root of 81742211 is about 9041.1399170680. The cubic root of 81742211 is about 433.9924025513.

Adding to 81742211 its reverse (11224718), we get a palindrome (92966929).

The spelling of 81742211 in words is "eighty-one million, seven hundred forty-two thousand, two hundred eleven".