155403313 has 4 divisors (see below), whose sum is σ = 167357428. Its totient is φ = 143449200.

The previous prime is 155403289. The next prime is 155403323. The reversal of 155403313 is 313304551.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 62916624 + 92486689 = 7932^2 + 9617^2 .

It is a cyclic number.

It is not a de Polignac number, because 155403313 - 2⁹ = 155402801 is a prime.

It is a super-3 number, since 3×155403313³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155403323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5977038 + ... + 5977063.

It is an arithmetic number, because the mean of its divisors is an integer number (41839357).

Almost surely, 2^155403313 is an apocalyptic number.

155403313 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

155403313 is a deficient number, since it is larger than the sum of its proper divisors (11954115).

155403313 is a wasteful number, since it uses less digits than its factorization.

155403313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11954114.

The product of its (nonzero) digits is 2700, while the sum is 25.

The square root of 155403313 is about 12466.0865150215. The cubic root of 155403313 is about 537.6340396194.

Adding to 155403313 its reverse (313304551), we get a palindrome (468707864).

The spelling of 155403313 in words is "one hundred fifty-five million, four hundred three thousand, three hundred thirteen".