81245461 has 8 divisors (see below), whose sum is σ = 88696800. Its totient is φ = 73805040.

The previous prime is 81245441. The next prime is 81245491. The reversal of 81245461 is 16454218.

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 81245461 - 2⁵ = 81245429 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 (81245441) 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, 26475 + ... + 29383.

It is an arithmetic number, because the mean of its divisors is an integer number (11087100).

Almost surely, 2^81245461 is an apocalyptic number.

It is an amenable number.

81245461 is a deficient number, since it is larger than the sum of its proper divisors (7451339).

81245461 is a wasteful number, since it uses less digits than its factorization.

81245461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5459.

The product of its digits is 7680, while the sum is 31.

The square root of 81245461 is about 9013.6264067244. The cubic root of 81245461 is about 433.1114871678. Note that the first 3 decimals are identical.

Adding to 81245461 its reverse (16454218), we get a palindrome (97699679).

It can be divided in two parts, 81 and 245461, that added together give a palindrome (245542).

The spelling of 81245461 in words is "eighty-one million, two hundred forty-five thousand, four hundred sixty-one".