81241437 has 8 divisors (see below), whose sum is σ = 108366336. Its totient is φ = 54138752.

The previous prime is 81241423. The next prime is 81241439. The reversal of 81241437 is 73414218.

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

It is a cyclic number.

It is not a de Polignac number, because 81241437 - 2¹² = 81237341 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81241439) 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, 7108 + ... + 14594.

It is an arithmetic number, because the mean of its divisors is an integer number (13545792).

Almost surely, 2^81241437 is an apocalyptic number.

It is an amenable number.

81241437 is a deficient number, since it is larger than the sum of its proper divisors (27124899).

81241437 is a wasteful number, since it uses less digits than its factorization.

81241437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11107.

The product of its digits is 5376, while the sum is 30.

The square root of 81241437 is about 9013.4031863664. The cubic root of 81241437 is about 433.1043365350.

The spelling of 81241437 in words is "eighty-one million, two hundred forty-one thousand, four hundred thirty-seven".