81248859 has 16 divisors (see below), whose sum is σ = 120589600. Its totient is φ = 54066528.

The previous prime is 81248833. The next prime is 81248863. The reversal of 81248859 is 95884218.

81248859 = T₁₇₇ + T₁₇₈ + ... + T₇₈₉.

It is a happy number.

It is not a de Polignac number, because 81248859 - 2⁸ = 81248603 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81248819) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14097 + ... + 19005.

It is an arithmetic number, because the mean of its divisors is an integer number (7536850).

Almost surely, 2^81248859 is an apocalyptic number.

81248859 is a deficient number, since it is larger than the sum of its proper divisors (39340741).

81248859 is a wasteful number, since it uses less digits than its factorization.

81248859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5531 (or 5525 counting only the distinct ones).

The product of its digits is 184320, while the sum is 45.

The square root of 81248859 is about 9013.8148971454. The cubic root of 81248859 is about 433.1175252172.

The spelling of 81248859 in words is "eighty-one million, two hundred forty-eight thousand, eight hundred fifty-nine".