815197 has 2 divisors, whose sum is σ = 815198. Its totient is φ = 815196.

The previous prime is 815173. The next prime is 815209. The reversal of 815197 is 791518.

815197 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 793881 + 21316 = 891^2 + 146^2 .

It is a cyclic number.

It is not a de Polignac number, because 815197 - 2¹⁵ = 782429 is a prime.

It is a super-2 number, since 2×815197² = 1329092297618, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (815897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407598 + 407599.

It is an arithmetic number, because the mean of its divisors is an integer number (407599).

2⁸¹⁵¹⁹⁷ is an apocalyptic number.

It is an amenable number.

815197 is a deficient number, since it is larger than the sum of its proper divisors (1).

815197 is an equidigital number, since it uses as much as digits as its factorization.

815197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 31.

The square root of 815197 is about 902.8826058796. The cubic root of 815197 is about 93.4159118927.

The spelling of 815197 in words is "eight hundred fifteen thousand, one hundred ninety-seven".