155321413 has 4 divisors (see below), whose sum is σ = 167269228. Its totient is φ = 143373600.

The previous prime is 155321399. The next prime is 155321473. The reversal of 155321413 is 314123551.

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: 314123551 = 7 ⋅44874793.

It can be written as a sum of positive squares in 2 ways, for example, as 55980324 + 99341089 = 7482^2 + 9967^2 .

It is a cyclic number.

It is not a de Polignac number, because 155321413 - 2⁹ = 155320901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155321473) 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, 5973888 + ... + 5973913.

It is an arithmetic number, because the mean of its divisors is an integer number (41817307).

Almost surely, 2^155321413 is an apocalyptic number.

155321413 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

155321413 is a deficient number, since it is larger than the sum of its proper divisors (11947815).

155321413 is a wasteful number, since it uses less digits than its factorization.

155321413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11947814.

The product of its digits is 1800, while the sum is 25.

The square root of 155321413 is about 12462.8011698815. The cubic root of 155321413 is about 537.5395758132.

Adding to 155321413 its reverse (314123551), we get a palindrome (469444964).

The spelling of 155321413 in words is "one hundred fifty-five million, three hundred twenty-one thousand, four hundred thirteen".