154943561 has 4 divisors (see below), whose sum is σ = 155051652. Its totient is φ = 154835472.

The previous prime is 154943533. The next prime is 154943563. The reversal of 154943561 is 165349451.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 165349451 = 89 ⋅1857859.

It can be written as a sum of positive squares in 2 ways, for example, as 152053561 + 2890000 = 12331^2 + 1700^2 .

It is a cyclic number.

It is not a de Polignac number, because 154943561 - 2⁶ = 154943497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (154943563) 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, 51866 + ... + 54771.

It is an arithmetic number, because the mean of its divisors is an integer number (38762913).

Almost surely, 2^154943561 is an apocalyptic number.

It is an amenable number.

154943561 is a deficient number, since it is larger than the sum of its proper divisors (108091).

154943561 is a wasteful number, since it uses less digits than its factorization.

154943561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108090.

The product of its digits is 64800, while the sum is 38.

The square root of 154943561 is about 12447.6327468318. The cubic root of 154943561 is about 537.1033291817.

The spelling of 154943561 in words is "one hundred fifty-four million, nine hundred forty-three thousand, five hundred sixty-one".