81459461 has 8 divisors (see below), whose sum is σ = 87666264. Its totient is φ = 75409920.

The previous prime is 81459449. The next prime is 81459467. The reversal of 81459461 is 16495418.

It can be written as a sum of positive squares in 4 ways, for example, as 8836 + 81450625 = 94^2 + 9025^2 .

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 81459461 - 2¹⁴ = 81443077 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 (81459467) 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, 38240 + ... + 40313.

It is an arithmetic number, because the mean of its divisors is an integer number (10958283).

Almost surely, 2^81459461 is an apocalyptic number.

It is an amenable number.

81459461 is a deficient number, since it is larger than the sum of its proper divisors (6206803).

81459461 is a wasteful number, since it uses less digits than its factorization.

81459461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78631.

The product of its digits is 34560, while the sum is 38.

The square root of 81459461 is about 9025.4895158102. The cubic root of 81459461 is about 433.4914246971.

The spelling of 81459461 in words is "eighty-one million, four hundred fifty-nine thousand, four hundred sixty-one".