155212401 has 16 divisors (see below), whose sum is σ = 210636800. Its totient is φ = 101640528.

The previous prime is 155212399. The next prime is 155212417. The reversal of 155212401 is 104212551.

It is not a de Polignac number, because 155212401 - 2¹ = 155212399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155212201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87360 + ... + 89118.

It is an arithmetic number, because the mean of its divisors is an integer number (13164800).

Almost surely, 2^155212401 is an apocalyptic number.

It is an amenable number.

155212401 is a deficient number, since it is larger than the sum of its proper divisors (55424399).

155212401 is a wasteful number, since it uses less digits than its factorization.

155212401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2268.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 155212401 is about 12458.4269071179. The cubic root of 155212401 is about 537.4137893822.

Adding to 155212401 its reverse (104212551), we get a palindrome (259424952).

The spelling of 155212401 in words is "one hundred fifty-five million, two hundred twelve thousand, four hundred one".