81094437 has 24 divisors (see below), whose sum is σ = 126074520. Its totient is φ = 50042880.

The previous prime is 81094427. The next prime is 81094457. The reversal of 81094437 is 73449018.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 16597476 + 64496961 = 4074^2 + 8031^2 .

It is not a de Polignac number, because 81094437 - 2⁴ = 81094421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81094427) 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, 4989 + ... + 13677.

It is an arithmetic number, because the mean of its divisors is an integer number (5253105).

Almost surely, 2^81094437 is an apocalyptic number.

It is an amenable number.

81094437 is a deficient number, since it is larger than the sum of its proper divisors (44980083).

81094437 is a wasteful number, since it uses less digits than its factorization.

81094437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8773 (or 8770 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 81094437 is about 9005.2449716818. The cubic root of 81094437 is about 432.8429560612.

The spelling of 81094437 in words is "eighty-one million, ninety-four thousand, four hundred thirty-seven".