155122313 has 4 divisors (see below), whose sum is σ = 155788308. Its totient is φ = 154456320.

The previous prime is 155122309. The next prime is 155122337. The reversal of 155122313 is 313221551.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 313221551 = 31 ⋅10103921.

It can be written as a sum of positive squares in 2 ways, for example, as 48888064 + 106234249 = 6992^2 + 10307^2 .

It is a cyclic number.

It is not a de Polignac number, because 155122313 - 2² = 155122309 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155122343) 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, 332648 + ... + 333113.

It is an arithmetic number, because the mean of its divisors is an integer number (38947077).

Almost surely, 2^155122313 is an apocalyptic number.

It is an amenable number.

155122313 is a deficient number, since it is larger than the sum of its proper divisors (665995).

155122313 is an equidigital number, since it uses as much as digits as its factorization.

155122313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665994.

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

The square root of 155122313 is about 12454.8108375840. The cubic root of 155122313 is about 537.3097944629.

Adding to 155122313 its reverse (313221551), we get a palindrome (468343864).

The spelling of 155122313 in words is "one hundred fifty-five million, one hundred twenty-two thousand, three hundred thirteen".