155749441 has 4 divisors (see below), whose sum is σ = 163946800. Its totient is φ = 147552084.

The previous prime is 155749421. The next prime is 155749463. The reversal of 155749441 is 144947551.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155749441 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 155749394 and 155749403.

It is not an unprimeable number, because it can be changed into a prime (155749421) 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, 4098651 + ... + 4098688.

It is an arithmetic number, because the mean of its divisors is an integer number (40986700).

Almost surely, 2^155749441 is an apocalyptic number.

It is an amenable number.

155749441 is a deficient number, since it is larger than the sum of its proper divisors (8197359).

155749441 is an equidigital number, since it uses as much as digits as its factorization.

155749441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8197358.

The product of its digits is 100800, while the sum is 40.

The square root of 155749441 is about 12479.9615784665. The cubic root of 155749441 is about 538.0328989984.

The spelling of 155749441 in words is "one hundred fifty-five million, seven hundred forty-nine thousand, four hundred forty-one".