81269108 has 6 divisors (see below), whose sum is σ = 142220946. Its totient is φ = 40634552.

The previous prime is 81269101. The next prime is 81269113. The reversal of 81269108 is 80196218.

It can be written as a sum of positive squares in only one way, i.e., 65092624 + 16176484 = 8068^2 + 4022^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81269101) 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 as a sum of consecutive naturals, namely, 10158635 + ... + 10158642.

It is an arithmetic number, because the mean of its divisors is an integer number (23703491).

Almost surely, 2^81269108 is an apocalyptic number.

It is an amenable number.

81269108 is a deficient number, since it is larger than the sum of its proper divisors (60951838).

81269108 is a wasteful number, since it uses less digits than its factorization.

81269108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20317281 (or 20317279 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 81269108 is about 9014.9380474854. The cubic root of 81269108 is about 433.1535030283.

The spelling of 81269108 in words is "eighty-one million, two hundred sixty-nine thousand, one hundred eight".