81062077 has 4 divisors (see below), whose sum is σ = 81194076. Its totient is φ = 80930080.

The previous prime is 81062057. The next prime is 81062081. The reversal of 81062077 is 77026018.

It is a happy number.

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 36252441 + 44809636 = 6021^2 + 6694^2 .

It is a cyclic number.

It is not a de Polignac number, because 81062077 - 2¹⁵ = 81029309 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81062017) 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, 65074 + ... + 66307.

It is an arithmetic number, because the mean of its divisors is an integer number (20298519).

Almost surely, 2^81062077 is an apocalyptic number.

It is an amenable number.

81062077 is a deficient number, since it is larger than the sum of its proper divisors (131999).

81062077 is a wasteful number, since it uses less digits than its factorization.

81062077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131998.

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 81062077 is about 9003.4480617150. The cubic root of 81062077 is about 432.7853743820.

The spelling of 81062077 in words is "eighty-one million, sixty-two thousand, seventy-seven".