81151287041 has 4 divisors (see below), whose sum is σ = 88528676784. Its totient is φ = 73773897300.

The previous prime is 81151286947. The next prime is 81151287083. The reversal of 81151287041 is 14078215118.

It is a happy number.

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 81151287041 - 2¹⁴ = 81151270657 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81151286986 and 81151287004.

It is not an unprimeable number, because it can be changed into a prime (81151287641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3688694855 + ... + 3688694876.

It is an arithmetic number, because the mean of its divisors is an integer number (22132169196).

Almost surely, 2^81151287041 is an apocalyptic number.

It is an amenable number.

81151287041 is a deficient number, since it is larger than the sum of its proper divisors (7377389743).

81151287041 is a wasteful number, since it uses less digits than its factorization.

81151287041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7377389742.

The product of its (nonzero) digits is 17920, while the sum is 38.

The spelling of 81151287041 in words is "eighty-one billion, one hundred fifty-one million, two hundred eighty-seven thousand, forty-one".