155421544 has 16 divisors (see below), whose sum is σ = 293641920. Its totient is φ = 77117040.

The previous prime is 155421523. The next prime is 155421547. The reversal of 155421544 is 445124551.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (155421547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73104 + ... + 75199.

It is an arithmetic number, because the mean of its divisors is an integer number (18352620).

Almost surely, 2^155421544 is an apocalyptic number.

It is an amenable number.

155421544 is a deficient number, since it is larger than the sum of its proper divisors (138220376).

155421544 is a wasteful number, since it uses less digits than its factorization.

155421544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148440 (or 148436 counting only the distinct ones).

The product of its digits is 16000, while the sum is 31.

The square root of 155421544 is about 12466.8177174450. The cubic root of 155421544 is about 537.6550628154.

The spelling of 155421544 in words is "one hundred fifty-five million, four hundred twenty-one thousand, five hundred forty-four".