155639541 has 4 divisors (see below), whose sum is σ = 207519392. Its totient is φ = 103759692.

The previous prime is 155639537. The next prime is 155639543. The reversal of 155639541 is 145936551.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 155639541 - 2² = 155639537 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 155639541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155639543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25939921 + ... + 25939926.

It is an arithmetic number, because the mean of its divisors is an integer number (51879848).

Almost surely, 2^155639541 is an apocalyptic number.

It is an amenable number.

155639541 is a deficient number, since it is larger than the sum of its proper divisors (51879851).

155639541 is an equidigital number, since it uses as much as digits as its factorization.

155639541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51879850.

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

The square root of 155639541 is about 12475.5577430430. The cubic root of 155639541 is about 537.9063202053.

The spelling of 155639541 in words is "one hundred fifty-five million, six hundred thirty-nine thousand, five hundred forty-one".