81011241 has 24 divisors (see below), whose sum is σ = 122006144. Its totient is φ = 51749280.

The previous prime is 81011219. The next prime is 81011263. The reversal of 81011241 is 14211018.

It is an interprime number because it is at equal distance from previous prime (81011219) and next prime (81011263).

It is not a de Polignac number, because 81011241 - 2⁵ = 81011209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81011741) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20496 + ... + 24126.

Almost surely, 2^81011241 is an apocalyptic number.

It is an amenable number.

81011241 is a deficient number, since it is larger than the sum of its proper divisors (40994903).

81011241 is a wasteful number, since it uses less digits than its factorization.

81011241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3741 (or 3738 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The square root of 81011241 is about 9000.6244783348. The cubic root of 81011241 is about 432.6948853854.

Adding to 81011241 its reverse (14211018), we get a palindrome (95222259).

The spelling of 81011241 in words is "eighty-one million, eleven thousand, two hundred forty-one".