81112437 has 12 divisors (see below), whose sum is σ = 133900000. Its totient is φ = 46349928.

The previous prime is 81112429. The next prime is 81112439. The reversal of 81112437 is 73421118.

It is not a de Polignac number, because 81112437 - 2³ = 81112429 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81112437.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81112439) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 643687 + ... + 643812.

Almost surely, 2^81112437 is an apocalyptic number.

It is an amenable number.

81112437 is a deficient number, since it is larger than the sum of its proper divisors (52787563).

81112437 is a wasteful number, since it uses less digits than its factorization.

81112437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1287512 (or 1287509 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 81112437 is about 9006.2443337942. The cubic root of 81112437 is about 432.8749787955.

The spelling of 81112437 in words is "eighty-one million, one hundred twelve thousand, four hundred thirty-seven".