815198253 has 4 divisors (see below), whose sum is σ = 1086931008. Its totient is φ = 543465500.

The previous prime is 815198243. The next prime is 815198261. The reversal of 815198253 is 352891518.

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 815198253 - 2¹² = 815194157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (815198213) 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, 135866373 + ... + 135866378.

It is an arithmetic number, because the mean of its divisors is an integer number (271732752).

Almost surely, 2^815198253 is an apocalyptic number.

It is an amenable number.

815198253 is a deficient number, since it is larger than the sum of its proper divisors (271732755).

815198253 is a wasteful number, since it uses less digits than its factorization.

815198253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271732754.

The product of its digits is 86400, while the sum is 42.

The square root of 815198253 is about 28551.6768859554. The cubic root of 815198253 is about 934.1595975439.

The spelling of 815198253 in words is "eight hundred fifteen million, one hundred ninety-eight thousand, two hundred fifty-three".