81269107 has 4 divisors (see below), whose sum is σ = 84071520. Its totient is φ = 78466696.

The previous prime is 81269101. The next prime is 81269113. The reversal of 81269107 is 70196218.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (81269101) and next prime (81269113).

It is a cyclic number.

It is not a de Polignac number, because 81269107 - 2¹⁹ = 80744819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81269101) 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, 1401163 + ... + 1401220.

It is an arithmetic number, because the mean of its divisors is an integer number (21017880).

Almost surely, 2^81269107 is an apocalyptic number.

81269107 is a deficient number, since it is larger than the sum of its proper divisors (2802413).

81269107 is a wasteful number, since it uses less digits than its factorization.

81269107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2802412.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 81269107 is about 9014.9379920219. The cubic root of 81269107 is about 433.1535012517.

The spelling of 81269107 in words is "eighty-one million, two hundred sixty-nine thousand, one hundred seven".