81262553 has 16 divisors (see below), whose sum is σ = 86780160. Its totient is φ = 75969600.

The previous prime is 81262547. The next prime is 81262583. The reversal of 81262553 is 35526218.

It is a cyclic number.

It is not a de Polignac number, because 81262553 - 2²⁰ = 80213977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81262513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125276 + ... + 125922.

It is an arithmetic number, because the mean of its divisors is an integer number (5423760).

Almost surely, 2^81262553 is an apocalyptic number.

It is an amenable number.

81262553 is a deficient number, since it is larger than the sum of its proper divisors (5517607).

81262553 is a wasteful number, since it uses less digits than its factorization.

81262553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 808.

The product of its digits is 14400, while the sum is 32.

The square root of 81262553 is about 9014.5744769235. The cubic root of 81262553 is about 433.1418569567.

The spelling of 81262553 in words is "eighty-one million, two hundred sixty-two thousand, five hundred fifty-three".