81461455 has 12 divisors (see below), whose sum is σ = 103171752. Its totient is φ = 61737840.

The previous prime is 81461453. The next prime is 81461461. The reversal of 81461455 is 55416418.

It is not a de Polignac number, because 81461455 - 2¹ = 81461453 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81461455.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81461453) 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 11 ways as a sum of consecutive naturals, for example, 20761 + ... + 24370.

It is an arithmetic number, because the mean of its divisors is an integer number (8597646).

Almost surely, 2^81461455 is an apocalyptic number.

81461455 is a deficient number, since it is larger than the sum of its proper divisors (21710297).

81461455 is a wasteful number, since it uses less digits than its factorization.

81461455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45174 (or 45155 counting only the distinct ones).

The product of its digits is 19200, while the sum is 34.

The square root of 81461455 is about 9025.5999800567. The cubic root of 81461455 is about 433.4949617319.

The spelling of 81461455 in words is "eighty-one million, four hundred sixty-one thousand, four hundred fifty-five".