245155811 has 2 divisors, whose sum is σ = 245155812. Its totient is φ = 245155810.

The previous prime is 245155789. The next prime is 245155831. The reversal of 245155811 is 118551542.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 245155811 - 2¹⁸ = 244893667 is a prime.

It is a Chen prime.

It is equal to p_13428752 and since 245155811 and 13428752 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (245155831) 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, 122577905 + 122577906.

It is an arithmetic number, because the mean of its divisors is an integer number (122577906).

Almost surely, 2^245155811 is an apocalyptic number.

245155811 is a deficient number, since it is larger than the sum of its proper divisors (1).

245155811 is an equidigital number, since it uses as much as digits as its factorization.

245155811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8000, while the sum is 32.

The square root of 245155811 is about 15657.4522512445. The cubic root of 245155811 is about 625.8650940804.

The spelling of 245155811 in words is "two hundred forty-five million, one hundred fifty-five thousand, eight hundred eleven".