815313201 has 4 divisors (see below), whose sum is σ = 1087084272. Its totient is φ = 543542132.

The previous prime is 815313197. The next prime is 815313211. The reversal of 815313201 is 102313518.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 815313201 - 2² = 815313197 is a prime.

It is not an unprimeable number, because it can be changed into a prime (815313211) 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, 135885531 + ... + 135885536.

It is an arithmetic number, because the mean of its divisors is an integer number (271771068).

Almost surely, 2^815313201 is an apocalyptic number.

It is an amenable number.

815313201 is a deficient number, since it is larger than the sum of its proper divisors (271771071).

815313201 is a wasteful number, since it uses less digits than its factorization.

815313201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271771070.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 815313201 is about 28553.6897965920. The cubic root of 815313201 is about 934.2035029090.

Adding to 815313201 its reverse (102313518), we get a palindrome (917626719).

The spelling of 815313201 in words is "eight hundred fifteen million, three hundred thirteen thousand, two hundred one".