806991145 has 8 divisors (see below), whose sum is σ = 968865480. Its totient is φ = 645275520.

The previous prime is 806991131. The next prime is 806991221. The reversal of 806991145 is 541199608.

It can be written as a sum of positive squares in 4 ways, for example, as 316412944 + 490578201 = 17788^2 + 22149^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-806991145 is a prime.

It is a super-2 number, since 2×806991145² = 1302469416216822050, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28186 + ... + 49075.

It is an arithmetic number, because the mean of its divisors is an integer number (121108185).

Almost surely, 2^806991145 is an apocalyptic number.

It is an amenable number.

806991145 is a deficient number, since it is larger than the sum of its proper divisors (161874335).

806991145 is a wasteful number, since it uses less digits than its factorization.

806991145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79355.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 806991145 is about 28407.5895668746. The cubic root of 806991145 is about 931.0140959446.

The spelling of 806991145 in words is "eight hundred six million, nine hundred ninety-one thousand, one hundred forty-five".