155161211 has 2 divisors, whose sum is σ = 155161212. Its totient is φ = 155161210.

The previous prime is 155161207. The next prime is 155161249. The reversal of 155161211 is 112161551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155161211 - 2² = 155161207 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (155161291) 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, 77580605 + 77580606.

It is an arithmetic number, because the mean of its divisors is an integer number (77580606).

Almost surely, 2^155161211 is an apocalyptic number.

155161211 is a deficient number, since it is larger than the sum of its proper divisors (1).

155161211 is an equidigital number, since it uses as much as digits as its factorization.

155161211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 300, while the sum is 23.

The square root of 155161211 is about 12456.3723049691. The cubic root of 155161211 is about 537.3547021001.

The spelling of 155161211 in words is "one hundred fifty-five million, one hundred sixty-one thousand, two hundred eleven".