155541639 has 32 divisors (see below), whose sum is σ = 232187904. Its totient is φ = 91824480.

The previous prime is 155541623. The next prime is 155541647. The reversal of 155541639 is 936145551.

It is a happy number.

It is not a de Polignac number, because 155541639 - 2⁴ = 155541623 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 155541597 and 155541606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155541689) 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 31 ways as a sum of consecutive naturals, for example, 227392 + ... + 228074.

It is an arithmetic number, because the mean of its divisors is an integer number (7255872).

Almost surely, 2^155541639 is an apocalyptic number.

155541639 is a deficient number, since it is larger than the sum of its proper divisors (76646265).

155541639 is a wasteful number, since it uses less digits than its factorization.

155541639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 867.

The product of its digits is 81000, while the sum is 39.

The square root of 155541639 is about 12471.6333733798. The cubic root of 155541639 is about 537.7935100756.

The spelling of 155541639 in words is "one hundred fifty-five million, five hundred forty-one thousand, six hundred thirty-nine".