81472461 has 8 divisors (see below), whose sum is σ = 124148544. Its totient is φ = 46555680.

The previous prime is 81472427. The next prime is 81472499. The reversal of 81472461 is 16427418.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81472461 - 2¹⁰ = 81471437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81472421) 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, 1939800 + ... + 1939841.

It is an arithmetic number, because the mean of its divisors is an integer number (15518568).

Almost surely, 2^81472461 is an apocalyptic number.

It is an amenable number.

81472461 is a deficient number, since it is larger than the sum of its proper divisors (42676083).

81472461 is a wasteful number, since it uses less digits than its factorization.

81472461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3879651.

The product of its digits is 10752, while the sum is 33.

The square root of 81472461 is about 9026.2096696232. The cubic root of 81472461 is about 433.5144835647.

Adding to 81472461 its reverse (16427418), we get a palindrome (97899879).

The spelling of 81472461 in words is "eighty-one million, four hundred seventy-two thousand, four hundred sixty-one".