81588951 has 14 divisors (see below), whose sum is σ = 122328560. Its totient is φ = 54392148.

The previous prime is 81588943. The next prime is 81589003. The reversal of 81588951 is 15988518.

It is not a de Polignac number, because 81588951 - 2³ = 81588943 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81588897 and 81588906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81588251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 55231 + ... + 56688.

Almost surely, 2^81588951 is an apocalyptic number.

81588951 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

81588951 is a deficient number, since it is larger than the sum of its proper divisors (40739609).

81588951 is an equidigital number, since it uses as much as digits as its factorization.

81588951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111937 (or 111922 counting only the distinct ones).

The product of its digits is 115200, while the sum is 45.

The square root of 81588951 is about 9032.6602393758. The cubic root of 81588951 is about 433.7209993705.

The spelling of 81588951 in words is "eighty-one million, five hundred eighty-eight thousand, nine hundred fifty-one".