81041137 has 8 divisors (see below), whose sum is σ = 87612800. Its totient is φ = 74700144.

The previous prime is 81041131. The next prime is 81041143. The reversal of 81041137 is 73114018.

It is an interprime number because it is at equal distance from previous prime (81041131) and next prime (81041143).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81041137 is a prime.

It is a super-3 number, since 3×81041137³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (81041131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56937 + ... + 58342.

It is an arithmetic number, because the mean of its divisors is an integer number (10951600).

Almost surely, 2^81041137 is an apocalyptic number.

It is an amenable number.

81041137 is a deficient number, since it is larger than the sum of its proper divisors (6571663).

81041137 is a wasteful number, since it uses less digits than its factorization.

81041137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115335.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 81041137 is about 9002.2850987957. The cubic root of 81041137 is about 432.7481053880.

The spelling of 81041137 in words is "eighty-one million, forty-one thousand, one hundred thirty-seven".