81267029 has 4 divisors (see below), whose sum is σ = 81887520. Its totient is φ = 80646540.

The previous prime is 81266993. The next prime is 81267037. The reversal of 81267029 is 92076218.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81267029 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 81267029.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81267049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 310049 + ... + 310310.

It is an arithmetic number, because the mean of its divisors is an integer number (20471880).

Almost surely, 2^81267029 is an apocalyptic number.

It is an amenable number.

81267029 is a deficient number, since it is larger than the sum of its proper divisors (620491).

81267029 is a wasteful number, since it uses less digits than its factorization.

81267029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620490.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 81267029 is about 9014.8227381352. The cubic root of 81267029 is about 433.1498093992.

The spelling of 81267029 in words is "eighty-one million, two hundred sixty-seven thousand, twenty-nine".