815553097 has 2 divisors, whose sum is σ = 815553098. Its totient is φ = 815553096.

The previous prime is 815553077. The next prime is 815553107. The reversal of 815553097 is 790355518.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 624450121 + 191102976 = 24989^2 + 13824^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-815553097 is a prime.

It is a super-3 number, since 3×815553097³ (a number of 28 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (815553077) by changing a digit.

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 as a sum of consecutive naturals, namely, 407776548 + 407776549.

It is an arithmetic number, because the mean of its divisors is an integer number (407776549).

Almost surely, 2^815553097 is an apocalyptic number.

It is an amenable number.

815553097 is a deficient number, since it is larger than the sum of its proper divisors (1).

815553097 is an equidigital number, since it uses as much as digits as its factorization.

815553097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 189000, while the sum is 43.

The square root of 815553097 is about 28557.8902757189. The cubic root of 815553097 is about 934.2951199327.

The spelling of 815553097 in words is "eight hundred fifteen million, five hundred fifty-three thousand, ninety-seven".