81498133 has 2 divisors, whose sum is σ = 81498134. Its totient is φ = 81498132.

The previous prime is 81498127. The next prime is 81498167. The reversal of 81498133 is 33189418.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81306289 + 191844 = 9017^2 + 438^2 .

It is a cyclic number.

It is not a de Polignac number, because 81498133 - 2⁹ = 81497621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81498092 and 81498101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81499133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40749066 + 40749067.

It is an arithmetic number, because the mean of its divisors is an integer number (40749067).

Almost surely, 2^81498133 is an apocalyptic number.

It is an amenable number.

81498133 is a deficient number, since it is larger than the sum of its proper divisors (1).

81498133 is an equidigital number, since it uses as much as digits as its factorization.

81498133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 37.

The square root of 81498133 is about 9027.6316384753. The cubic root of 81498133 is about 433.5600123031.

The spelling of 81498133 in words is "eighty-one million, four hundred ninety-eight thousand, one hundred thirty-three".