155481813 has 12 divisors (see below), whose sum is σ = 237795948. Its totient is φ = 97557120.

The previous prime is 155481793. The next prime is 155481829. The reversal of 155481813 is 318184551.

155481813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 99860049 + 55621764 = 9993^2 + 7458^2 .

It is not a de Polignac number, because 155481813 - 2⁶ = 155481749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155481853) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 507958 + ... + 508263.

It is an arithmetic number, because the mean of its divisors is an integer number (19816329).

Almost surely, 2^155481813 is an apocalyptic number.

It is an amenable number.

155481813 is a deficient number, since it is larger than the sum of its proper divisors (82314135).

155481813 is a wasteful number, since it uses less digits than its factorization.

155481813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1016244 (or 1016241 counting only the distinct ones).

The product of its digits is 19200, while the sum is 36.

The square root of 155481813 is about 12469.2346597536. The cubic root of 155481813 is about 537.7245507052.

The spelling of 155481813 in words is "one hundred fifty-five million, four hundred eighty-one thousand, eight hundred thirteen".