81373461 has 16 divisors (see below), whose sum is σ = 117237120. Its totient is φ = 49907520.

The previous prime is 81373429. The next prime is 81373463. The reversal of 81373461 is 16437318.

It is not a de Polignac number, because 81373461 - 2⁵ = 81373429 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81373463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8775 + ... + 15483.

It is an arithmetic number, because the mean of its divisors is an integer number (7327320).

Almost surely, 2^81373461 is an apocalyptic number.

It is an amenable number.

81373461 is a deficient number, since it is larger than the sum of its proper divisors (35863659).

81373461 is a wasteful number, since it uses less digits than its factorization.

81373461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7036.

The product of its digits is 12096, while the sum is 33.

The square root of 81373461 is about 9020.7239731631. The cubic root of 81373461 is about 433.3388195887.

The spelling of 81373461 in words is "eighty-one million, three hundred seventy-three thousand, four hundred sixty-one".