81296986 has 8 divisors (see below), whose sum is σ = 122286240. Its totient is φ = 40534908.

The previous prime is 81296983. The next prime is 81296987. The reversal of 81296986 is 68969218.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (81296983) 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, 55896 + ... + 57331.

It is an arithmetic number, because the mean of its divisors is an integer number (15285780).

Almost surely, 2^81296986 is an apocalyptic number.

81296986 is a deficient number, since it is larger than the sum of its proper divisors (40989254).

81296986 is a wasteful number, since it uses less digits than its factorization.

81296986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113588.

The product of its digits is 373248, while the sum is 49.

The square root of 81296986 is about 9016.4841263100. The cubic root of 81296986 is about 433.2030260396.

The spelling of 81296986 in words is "eighty-one million, two hundred ninety-six thousand, nine hundred eighty-six".