154812661 has 2 divisors, whose sum is σ = 154812662. Its totient is φ = 154812660.

The previous prime is 154812641. The next prime is 154812677. The reversal of 154812661 is 166218451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94206436 + 60606225 = 9706^2 + 7785^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-154812661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (154812641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77406330 + 77406331.

It is an arithmetic number, because the mean of its divisors is an integer number (77406331).

Almost surely, 2^154812661 is an apocalyptic number.

It is an amenable number.

154812661 is a deficient number, since it is larger than the sum of its proper divisors (1).

154812661 is an equidigital number, since it uses as much as digits as its factorization.

154812661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 34.

The square root of 154812661 is about 12442.3736079576. The cubic root of 154812661 is about 536.9520340185.

The spelling of 154812661 in words is "one hundred fifty-four million, eight hundred twelve thousand, six hundred sixty-one".