81029121 has 8 divisors (see below), whose sum is σ = 108081600. Its totient is φ = 53998032.

The previous prime is 81029119. The next prime is 81029141. The reversal of 81029121 is 12192018.

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

It is not a de Polignac number, because 81029121 - 2¹ = 81029119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81029091 and 81029100.

It is not an unprimeable number, because it can be changed into a prime (81029101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8980 + ... + 15578.

It is an arithmetic number, because the mean of its divisors is an integer number (13510200).

Almost surely, 2^81029121 is an apocalyptic number.

It is an amenable number.

81029121 is a deficient number, since it is larger than the sum of its proper divisors (27052479).

81029121 is a wasteful number, since it uses less digits than its factorization.

81029121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10695.

The product of its (nonzero) digits is 288, while the sum is 24.

The square root of 81029121 is about 9001.6176879492. The cubic root of 81029121 is about 432.7267164225.

The spelling of 81029121 in words is "eighty-one million, twenty-nine thousand, one hundred twenty-one".