155312223 has 32 divisors (see below), whose sum is σ = 233017344. Its totient is φ = 91200000.

The previous prime is 155312219. The next prime is 155312233. The reversal of 155312223 is 322213551.

It is a happy number.

It is not a de Polignac number, because 155312223 - 2² = 155312219 is a prime.

It is a super-2 number, since 2×155312223² = 48243773226403458, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 155312193 and 155312202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155312203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 258123 + ... + 258723.

It is an arithmetic number, because the mean of its divisors is an integer number (7281792).

Almost surely, 2^155312223 is an apocalyptic number.

155312223 is a deficient number, since it is larger than the sum of its proper divisors (77705121).

155312223 is a wasteful number, since it uses less digits than its factorization.

155312223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 847.

The product of its digits is 1800, while the sum is 24.

The square root of 155312223 is about 12462.4324672192. The cubic root of 155312223 is about 537.5289739564.

Adding to 155312223 its reverse (322213551), we get a palindrome (477525774).

The spelling of 155312223 in words is "one hundred fifty-five million, three hundred twelve thousand, two hundred twenty-three".