815212801 has 4 divisors (see below), whose sum is σ = 877921492. Its totient is φ = 752504112.

The previous prime is 815212789. The next prime is 815212813. The reversal of 815212801 is 108212518.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (815212789) and next prime (815212813).

It can be written as a sum of positive squares in 2 ways, for example, as 357210000 + 458002801 = 18900^2 + 21401^2 .

It is a cyclic number.

It is not a de Polignac number, because 815212801 - 2⁹ = 815212289 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 815212801.

It is not an unprimeable number, because it can be changed into a prime (815212831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31354326 + ... + 31354351.

It is an arithmetic number, because the mean of its divisors is an integer number (219480373).

Almost surely, 2^815212801 is an apocalyptic number.

It is an amenable number.

815212801 is a deficient number, since it is larger than the sum of its proper divisors (62708691).

815212801 is a wasteful number, since it uses less digits than its factorization.

815212801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62708690.

The product of its (nonzero) digits is 1280, while the sum is 28.

The square root of 815212801 is about 28551.9316509409. The cubic root of 815212801 is about 934.1651545042.

The spelling of 815212801 in words is "eight hundred fifteen million, two hundred twelve thousand, eight hundred one".