81461047291 has 8 divisors (see below), whose sum is σ = 87736382384. Its totient is φ = 75187012320.

The previous prime is 81461047277. The next prime is 81461047301. The reversal of 81461047291 is 19274016418.

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 81461047291 - 2¹⁹ = 81460523003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81461047201) 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, 192900 + ... + 447361.

It is an arithmetic number, because the mean of its divisors is an integer number (10967047798).

Almost surely, 2^81461047291 is an apocalyptic number.

81461047291 is a deficient number, since it is larger than the sum of its proper divisors (6275335093).

81461047291 is a wasteful number, since it uses less digits than its factorization.

81461047291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650061.

The product of its (nonzero) digits is 96768, while the sum is 43.

The spelling of 81461047291 in words is "eighty-one billion, four hundred sixty-one million, forty-seven thousand, two hundred ninety-one".