81278941 has 8 divisors (see below), whose sum is σ = 89277120. Its totient is φ = 73652832.

The previous prime is 81278927. The next prime is 81278947. The reversal of 81278941 is 14987218.

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 not a de Polignac number, because 81278941 - 2¹¹ = 81276893 is a prime.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81278894 and 81278903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81278947) 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, 92560 + ... + 93433.

It is an arithmetic number, because the mean of its divisors is an integer number (11159640).

Almost surely, 2^81278941 is an apocalyptic number.

It is an amenable number.

81278941 is a deficient number, since it is larger than the sum of its proper divisors (7998179).

81278941 is a wasteful number, since it uses less digits than its factorization.

81278941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186035.

The product of its digits is 32256, while the sum is 40.

The square root of 81278941 is about 9015.4834035674. The cubic root of 81278941 is about 433.1709718498.

The spelling of 81278941 in words is "eighty-one million, two hundred seventy-eight thousand, nine hundred forty-one".