81414381 has 8 divisors (see below), whose sum is σ = 108623200. Its totient is φ = 54240912.

The previous prime is 81414349. The next prime is 81414407. The reversal of 81414381 is 18341418.

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

It is not a de Polignac number, because 81414381 - 2⁵ = 81414349 is a prime.

It is a super-2 number, since 2×81414381² = 13256602867226322, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81414301) 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, 2890 + ... + 13083.

It is an arithmetic number, because the mean of its divisors is an integer number (13577900).

Almost surely, 2^81414381 is an apocalyptic number.

It is an amenable number.

81414381 is a deficient number, since it is larger than the sum of its proper divisors (27208819).

81414381 is a wasteful number, since it uses less digits than its factorization.

81414381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17675.

The product of its digits is 3072, while the sum is 30.

The square root of 81414381 is about 9022.9917987328. The cubic root of 81414381 is about 433.4114446304.

Adding to 81414381 its reverse (18341418), we get a palindrome (99755799).

The spelling of 81414381 in words is "eighty-one million, four hundred fourteen thousand, three hundred eighty-one".