81313802 has 8 divisors (see below), whose sum is σ = 122778912. Its totient is φ = 40387500.

The previous prime is 81313723. The next prime is 81313811. The reversal of 81313802 is 20831318.

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

It is a super-2 number, since 2×81313802² = 13223868791390408, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134324 + ... + 134927.

It is an arithmetic number, because the mean of its divisors is an integer number (15347364).

Almost surely, 2^81313802 is an apocalyptic number.

81313802 is a deficient number, since it is larger than the sum of its proper divisors (41465110).

81313802 is a wasteful number, since it uses less digits than its factorization.

81313802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269404.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 81313802 is about 9017.4165923506. The cubic root of 81313802 is about 433.2328928289.

The spelling of 81313802 in words is "eighty-one million, three hundred thirteen thousand, eight hundred two".