81553043 has 16 divisors (see below), whose sum is σ = 97036800. Its totient is φ = 67560480.

The previous prime is 81553019. The next prime is 81553081. The reversal of 81553043 is 34035518.

It is not a de Polignac number, because 81553043 - 2¹⁰ = 81552019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81552997 and 81553015.

It is not an unprimeable number, because it can be changed into a prime (81553013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7688 + ... + 14906.

It is an arithmetic number, because the mean of its divisors is an integer number (6064800).

Almost surely, 2^81553043 is an apocalyptic number.

81553043 is a deficient number, since it is larger than the sum of its proper divisors (15483757).

81553043 is a wasteful number, since it uses less digits than its factorization.

81553043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7322.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 81553043 is about 9030.6723448479. The cubic root of 81553043 is about 433.6573619181.

The spelling of 81553043 in words is "eighty-one million, five hundred fifty-three thousand, forty-three".