154411661 has 4 divisors (see below), whose sum is σ = 154491132. Its totient is φ = 154332192.

The previous prime is 154411657. The next prime is 154411687. The reversal of 154411661 is 166114451.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166114451 = 787 ⋅211073.

It can be written as a sum of positive squares in 2 ways, for example, as 125305636 + 29106025 = 11194^2 + 5395^2 .

It is a cyclic number.

It is not a de Polignac number, because 154411661 - 2² = 154411657 is a prime.

It is a super-2 number, since 2×154411661² = 47685922105557842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154411601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36746 + ... + 40731.

It is an arithmetic number, because the mean of its divisors is an integer number (38622783).

Almost surely, 2^154411661 is an apocalyptic number.

It is an amenable number.

154411661 is a deficient number, since it is larger than the sum of its proper divisors (79471).

154411661 is an equidigital number, since it uses as much as digits as its factorization.

154411661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79470.

The product of its digits is 2880, while the sum is 29.

The square root of 154411661 is about 12426.2488708379. The cubic root of 154411661 is about 536.4880238625.

The spelling of 154411661 in words is "one hundred fifty-four million, four hundred eleven thousand, six hundred sixty-one".