155385913 has 2 divisors, whose sum is σ = 155385914. Its totient is φ = 155385912.

The previous prime is 155385911. The next prime is 155385943. The reversal of 155385913 is 319583551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153066384 + 2319529 = 12372^2 + 1523^2 .

It is a cyclic number.

It is not a de Polignac number, because 155385913 - 2¹ = 155385911 is a prime.

Together with 155385911, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (155385911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77692956 + 77692957.

It is an arithmetic number, because the mean of its divisors is an integer number (77692957).

Almost surely, 2^155385913 is an apocalyptic number.

It is an amenable number.

155385913 is a deficient number, since it is larger than the sum of its proper divisors (1).

155385913 is an equidigital number, since it uses as much as digits as its factorization.

155385913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81000, while the sum is 40.

The square root of 155385913 is about 12465.3886020453. The cubic root of 155385913 is about 537.6139731630.

The spelling of 155385913 in words is "one hundred fifty-five million, three hundred eighty-five thousand, nine hundred thirteen".