155212011 has 16 divisors (see below), whose sum is σ = 232857600. Its totient is φ = 102163464.

The previous prime is 155211997. The next prime is 155212049. The reversal of 155212011 is 110212551.

It is not a de Polignac number, because 155212011 - 2⁹ = 155211499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155212051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34251 + ... + 38516.

It is an arithmetic number, because the mean of its divisors is an integer number (14553600).

Almost surely, 2^155212011 is an apocalyptic number.

155212011 is a deficient number, since it is larger than the sum of its proper divisors (77645589).

155212011 is an equidigital number, since it uses as much as digits as its factorization.

155212011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72855 (or 72849 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 18.

The square root of 155212011 is about 12458.4112550517. The cubic root of 155212011 is about 537.4133392645.

Adding to 155212011 its reverse (110212551), we get a palindrome (265424562).

The spelling of 155212011 in words is "one hundred fifty-five million, two hundred twelve thousand, eleven".