155231001 has 12 divisors (see below), whose sum is σ = 225861012. Its totient is φ = 102731136.

The previous prime is 155230993. The next prime is 155231017. The reversal of 155231001 is 100132551.

It can be written as a sum of positive squares in 2 ways, for example, as 115541001 + 39690000 = 10749^2 + 6300^2 .

It is not a de Polignac number, because 155231001 - 2³ = 155230993 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (155231051) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61716 + ... + 64181.

It is an arithmetic number, because the mean of its divisors is an integer number (18821751).

Almost surely, 2^155231001 is an apocalyptic number.

It is an amenable number.

155231001 is a deficient number, since it is larger than the sum of its proper divisors (70630011).

155231001 is a wasteful number, since it uses less digits than its factorization.

155231001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126040 (or 126037 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 155231001 is about 12459.1733674430. The cubic root of 155231001 is about 537.4352556593.

Adding to 155231001 its reverse (100132551), we get a palindrome (255363552).

The spelling of 155231001 in words is "one hundred fifty-five million, two hundred thirty-one thousand, one".