155121441 has 8 divisors (see below), whose sum is σ = 207050784. Its totient is φ = 103303200.

The previous prime is 155121433. The next prime is 155121451. The reversal of 155121441 is 144121551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 155121441 - 2³ = 155121433 is a prime.

It is a super-2 number, since 2×155121441² = 48125322915832962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (155121451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24460 + ... + 30141.

It is an arithmetic number, because the mean of its divisors is an integer number (25881348).

Almost surely, 2^155121441 is an apocalyptic number.

It is an amenable number.

155121441 is a deficient number, since it is larger than the sum of its proper divisors (51929343).

155121441 is an equidigital number, since it uses as much as digits as its factorization.

155121441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55551.

The product of its digits is 800, while the sum is 24.

The square root of 155121441 is about 12454.7758309815. The cubic root of 155121441 is about 537.3087876552.

Adding to 155121441 its reverse (144121551), we get a palindrome (299242992).

The spelling of 155121441 in words is "one hundred fifty-five million, one hundred twenty-one thousand, four hundred forty-one".