155211233 has 4 divisors (see below), whose sum is σ = 155508528. Its totient is φ = 154913940.

The previous prime is 155211229. The next prime is 155211253. The reversal of 155211233 is 332112551.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 332112551 = 73 ⋅4549487.

It is a cyclic number.

It is not a de Polignac number, because 155211233 - 2² = 155211229 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 155211199 and 155211208.

It is not an unprimeable number, because it can be changed into a prime (155211223) 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 3 ways as a sum of consecutive naturals, for example, 147863 + ... + 148908.

It is an arithmetic number, because the mean of its divisors is an integer number (38877132).

Almost surely, 2^155211233 is an apocalyptic number.

It is an amenable number.

155211233 is a deficient number, since it is larger than the sum of its proper divisors (297295).

155211233 is an equidigital number, since it uses as much as digits as its factorization.

155211233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297294.

The product of its digits is 900, while the sum is 23.

The square root of 155211233 is about 12458.3800311276. The cubic root of 155211233 is about 537.4124413351.

Adding to 155211233 its reverse (332112551), we get a palindrome (487323784).

The spelling of 155211233 in words is "one hundred fifty-five million, two hundred eleven thousand, two hundred thirty-three".