154040261 has 4 divisors (see below), whose sum is σ = 154701612. Its totient is φ = 153378912.

The previous prime is 154040219. The next prime is 154040267. The reversal of 154040261 is 162040451.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38068900 + 115971361 = 6170^2 + 10769^2 .

It is a cyclic number.

It is not a de Polignac number, because 154040261 - 2¹⁸ = 153778117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154040267) 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, 330326 + ... + 330791.

It is an arithmetic number, because the mean of its divisors is an integer number (38675403).

Almost surely, 2^154040261 is an apocalyptic number.

It is an amenable number.

154040261 is a deficient number, since it is larger than the sum of its proper divisors (661351).

154040261 is an equidigital number, since it uses as much as digits as its factorization.

154040261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661350.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 154040261 is about 12411.2957018999. The cubic root of 154040261 is about 536.0575477029.

The spelling of 154040261 in words is "one hundred fifty-four million, forty thousand, two hundred sixty-one".