81485037 has 6 divisors (see below), whose sum is σ = 117700622. Its totient is φ = 54323352.

The previous prime is 81485023. The next prime is 81485057. The reversal of 81485037 is 73058418.

81485037 is a `hidden beast` number, since 8 + 148 + 503 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 65755881 + 15729156 = 8109^2 + 3966^2 .

It is not a de Polignac number, because 81485037 - 2¹² = 81480941 is a prime.

It is a super-3 number, since 3×81485037³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81484992 and 81485010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81485017) 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 5 ways as a sum of consecutive naturals, for example, 4526938 + ... + 4526955.

Almost surely, 2^81485037 is an apocalyptic number.

It is an amenable number.

81485037 is a deficient number, since it is larger than the sum of its proper divisors (36215585).

81485037 is a wasteful number, since it uses less digits than its factorization.

81485037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9053899 (or 9053896 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 81485037 is about 9026.9062806700. The cubic root of 81485037 is about 433.5367880243.

The spelling of 81485037 in words is "eighty-one million, four hundred eighty-five thousand, thirty-seven".