1813312155 has 8 divisors (see below), whose sum is σ = 2901299472. Its totient is φ = 967099808.

The previous prime is 1813312153. The next prime is 1813312159. The reversal of 1813312155 is 5512133181.

1813312155 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1813312155 - 2¹ = 1813312153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1813312153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60443724 + ... + 60443753.

It is an arithmetic number, because the mean of its divisors is an integer number (362662434).

Almost surely, 2^1813312155 is an apocalyptic number.

1813312155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1813312155 is a deficient number, since it is larger than the sum of its proper divisors (1087987317).

1813312155 is a wasteful number, since it uses less digits than its factorization.

1813312155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120887485.

The product of its digits is 3600, while the sum is 30.

The square root of 1813312155 is about 42583.0031233120. The cubic root of 1813312155 is about 1219.4318224584.

The spelling of 1813312155 in words is "one billion, eight hundred thirteen million, three hundred twelve thousand, one hundred fifty-five".