81077141 has 4 divisors (see below), whose sum is σ = 81102432. Its totient is φ = 81051852.

The previous prime is 81077137. The next prime is 81077149. The reversal of 81077141 is 14177018.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81077141 - 2² = 81077137 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81077149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6995 + ... + 14528.

It is an arithmetic number, because the mean of its divisors is an integer number (20275608).

Almost surely, 2^81077141 is an apocalyptic number.

It is an amenable number.

81077141 is a deficient number, since it is larger than the sum of its proper divisors (25291).

81077141 is a wasteful number, since it uses less digits than its factorization.

81077141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25290.

The product of its (nonzero) digits is 1568, while the sum is 29.

The square root of 81077141 is about 9004.2845912377. The cubic root of 81077141 is about 432.8121813071.

It can be divided in two parts, 81077 and 141, that added together give a palindrome (81218).

The spelling of 81077141 in words is "eighty-one million, seventy-seven thousand, one hundred forty-one".