81037105 has 4 divisors (see below), whose sum is σ = 97244532. Its totient is φ = 64829680.

The previous prime is 81037091. The next prime is 81037153. The reversal of 81037105 is 50173018.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 54863649 + 26173456 = 7407^2 + 5116^2 .

It is a de Polignac number, because none of the positive numbers 2^k-81037105 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 81037105.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8103706 + ... + 8103715.

It is an arithmetic number, because the mean of its divisors is an integer number (24311133).

Almost surely, 2^81037105 is an apocalyptic number.

It is an amenable number.

81037105 is a deficient number, since it is larger than the sum of its proper divisors (16207427).

81037105 is a wasteful number, since it uses less digits than its factorization.

81037105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16207426.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 81037105 is about 9002.0611528694. The cubic root of 81037105 is about 432.7409285008.

It can be divided in two parts, 8103 and 7105, that multiplied together give a triangular number (57571815 = T₁₀₇₃₀).

The spelling of 81037105 in words is "eighty-one million, thirty-seven thousand, one hundred five".