155323513 has 2 divisors, whose sum is σ = 155323514. Its totient is φ = 155323512.

The previous prime is 155323489. The next prime is 155323523. The reversal of 155323513 is 315323551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82937449 + 72386064 = 9107^2 + 8508^2 .

It is an emirp because it is prime and its reverse (315323551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155323513 - 2⁹ = 155323001 is a prime.

It is a super-2 number, since 2×155323513² = 48250787381322338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (155323523) 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 as a sum of consecutive naturals, namely, 77661756 + 77661757.

It is an arithmetic number, because the mean of its divisors is an integer number (77661757).

Almost surely, 2^155323513 is an apocalyptic number.

It is an amenable number.

155323513 is a deficient number, since it is larger than the sum of its proper divisors (1).

155323513 is an equidigital number, since it uses as much as digits as its factorization.

155323513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6750, while the sum is 28.

The square root of 155323513 is about 12462.8854203190. The cubic root of 155323513 is about 537.5419983769.

The spelling of 155323513 in words is "one hundred fifty-five million, three hundred twenty-three thousand, five hundred thirteen".