155642441 has 4 divisors (see below), whose sum is σ = 155691984. Its totient is φ = 155592900.

The previous prime is 155642419. The next prime is 155642447. The reversal of 155642441 is 144246551.

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, and also an emirpimes, since its reverse is a distinct semiprime: 144246551 = 29 ⋅4974019.

It is a cyclic number.

It is not a de Polignac number, because 155642441 - 2¹⁴ = 155626057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 155642398 and 155642407.

It is not an unprimeable number, because it can be changed into a prime (155642447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19715 + ... + 26456.

It is an arithmetic number, because the mean of its divisors is an integer number (38922996).

Almost surely, 2^155642441 is an apocalyptic number.

It is an amenable number.

155642441 is a deficient number, since it is larger than the sum of its proper divisors (49543).

155642441 is an equidigital number, since it uses as much as digits as its factorization.

155642441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49542.

The product of its digits is 19200, while the sum is 32.

The square root of 155642441 is about 12475.6739697701. The cubic root of 155642441 is about 537.9096610843.

Adding to 155642441 its reverse (144246551), we get a palindrome (299888992).

The spelling of 155642441 in words is "one hundred fifty-five million, six hundred forty-two thousand, four hundred forty-one".