809155031 has 2 divisors, whose sum is σ = 809155032. Its totient is φ = 809155030.

The previous prime is 809155027. The next prime is 809155091. The reversal of 809155031 is 130551908.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 809155031 - 2² = 809155027 is a prime.

It is a super-2 number, since 2×809155031² = 1309463728385221922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (809155021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404577515 + 404577516.

It is an arithmetic number, because the mean of its divisors is an integer number (404577516).

Almost surely, 2^809155031 is an apocalyptic number.

809155031 is a deficient number, since it is larger than the sum of its proper divisors (1).

809155031 is an equidigital number, since it uses as much as digits as its factorization.

809155031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 32.

The square root of 809155031 is about 28445.6504759515. The cubic root of 809155031 is about 931.8455013384.

The spelling of 809155031 in words is "eight hundred nine million, one hundred fifty-five thousand, thirty-one".