154400561 has 8 divisors (see below), whose sum is σ = 176678784. Its totient is φ = 132177600.

The previous prime is 154400557. The next prime is 154400563. The reversal of 154400561 is 165004451.

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

It is a cyclic number.

It is not a de Polignac number, because 154400561 - 2² = 154400557 is a prime.

It is a super-2 number, since 2×154400561² = 47679066474229442, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 154400561.

It is not an unprimeable number, because it can be changed into a prime (154400563) 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, 7640 + ... + 19161.

It is an arithmetic number, because the mean of its divisors is an integer number (22084848).

Almost surely, 2^154400561 is an apocalyptic number.

It is an amenable number.

154400561 is a deficient number, since it is larger than the sum of its proper divisors (22278223).

154400561 is an equidigital number, since it uses as much as digits as its factorization.

154400561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27631.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 154400561 is about 12425.8022276230. The cubic root of 154400561 is about 536.4751682708.

The spelling of 154400561 in words is "one hundred fifty-four million, four hundred thousand, five hundred sixty-one".