81095290 has 8 divisors (see below), whose sum is σ = 145971540. Its totient is φ = 32438112.

The previous prime is 81095279. The next prime is 81095297. The reversal of 81095290 is 9259018.

It can be written as a sum of positive squares in 2 ways, for example, as 72029169 + 9066121 = 8487^2 + 3011^2 .

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

It is not an unprimeable number, because it can be changed into a prime (81095297) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4054755 + ... + 4054774.

Almost surely, 2^81095290 is an apocalyptic number.

81095290 is a deficient number, since it is larger than the sum of its proper divisors (64876250).

81095290 is a wasteful number, since it uses less digits than its factorization.

81095290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8109536.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 81095290 is about 9005.2923328452. The cubic root of 81095290 is about 432.8444736900.

It can be divided in two parts, 810 and 95290, that added together give a square (96100 = 310²).

The spelling of 81095290 in words is "eighty-one million, ninety-five thousand, two hundred ninety".