81148461 has 16 divisors (see below), whose sum is σ = 110792448. Its totient is φ = 52808000.

The previous prime is 81148427. The next prime is 81148477. The reversal of 81148461 is 16484118.

It is a cyclic number.

It is not a de Polignac number, because 81148461 - 2⁹ = 81147949 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81148861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98431 + ... + 99251.

It is an arithmetic number, because the mean of its divisors is an integer number (6924528).

Almost surely, 2^81148461 is an apocalyptic number.

It is an amenable number.

81148461 is a deficient number, since it is larger than the sum of its proper divisors (29643987).

81148461 is a wasteful number, since it uses less digits than its factorization.

81148461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1572.

The product of its digits is 6144, while the sum is 33.

The square root of 81148461 is about 9008.2440575286. The cubic root of 81148461 is about 432.9390527355.

The spelling of 81148461 in words is "eighty-one million, one hundred forty-eight thousand, four hundred sixty-one".