155434509 has 6 divisors (see below), whose sum is σ = 224516526. Its totient is φ = 103623000.

The previous prime is 155434507. The next prime is 155434523. The reversal of 155434509 is 905434551.

155434509 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 only one way, i.e., 84824100 + 70610409 = 9210^2 + 8403^2 .

It is not a de Polignac number, because 155434509 - 2¹ = 155434507 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155434501) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8635242 + ... + 8635259.

It is an arithmetic number, because the mean of its divisors is an integer number (37419421).

Almost surely, 2^155434509 is an apocalyptic number.

It is an amenable number.

155434509 is a deficient number, since it is larger than the sum of its proper divisors (69082017).

155434509 is a wasteful number, since it uses less digits than its factorization.

155434509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17270507 (or 17270504 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The square root of 155434509 is about 12467.3376869322. The cubic root of 155434509 is about 537.6700124890.

It can be divided in two parts, 1554 and 34509, that added together give a palindrome (36063).

The spelling of 155434509 in words is "one hundred fifty-five million, four hundred thirty-four thousand, five hundred nine".