155423813 has 4 divisors (see below), whose sum is σ = 156876480. Its totient is φ = 153971148.

The previous prime is 155423803. The next prime is 155423833. The reversal of 155423813 is 318324551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 155423813 - 2⁴ = 155423797 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 155423813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155423803) 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 in 3 ways as a sum of consecutive naturals, for example, 726173 + ... + 726386.

It is an arithmetic number, because the mean of its divisors is an integer number (39219120).

Almost surely, 2^155423813 is an apocalyptic number.

It is an amenable number.

155423813 is a deficient number, since it is larger than the sum of its proper divisors (1452667).

155423813 is a wasteful number, since it uses less digits than its factorization.

155423813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1452666.

The product of its digits is 14400, while the sum is 32.

The square root of 155423813 is about 12466.9087186840. The cubic root of 155423813 is about 537.6576792125.

The spelling of 155423813 in words is "one hundred fifty-five million, four hundred twenty-three thousand, eight hundred thirteen".