81269099 has 8 divisors (see below), whose sum is σ = 85731840. Its totient is φ = 76824936.

The previous prime is 81269081. The next prime is 81269101. The reversal of 81269099 is 99096218.

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

It is a cyclic number.

It is not a de Polignac number, because 81269099 - 2²⁴ = 64491883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81269039) 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, 4862 + ... + 13644.

It is an arithmetic number, because the mean of its divisors is an integer number (10716480).

Almost surely, 2^81269099 is an apocalyptic number.

81269099 is a deficient number, since it is larger than the sum of its proper divisors (4462741).

81269099 is a wasteful number, since it uses less digits than its factorization.

81269099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9289.

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 81269099 is about 9014.9375483139. The cubic root of 81269099 is about 433.1534870387.

The spelling of 81269099 in words is "eighty-one million, two hundred sixty-nine thousand, ninety-nine".