154481749 has 2 divisors, whose sum is σ = 154481750. Its totient is φ = 154481748.

The previous prime is 154481683. The next prime is 154481759. The reversal of 154481749 is 947184451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154380625 + 101124 = 12425^2 + 318^2 .

It is an emirp because it is prime and its reverse (947184451) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 154481749 - 2⁹ = 154481237 is a prime.

It is a super-2 number, since 2×154481749² = 47729221548198002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (154481759) 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, 77240874 + 77240875.

It is an arithmetic number, because the mean of its divisors is an integer number (77240875).

Almost surely, 2^154481749 is an apocalyptic number.

It is an amenable number.

154481749 is a deficient number, since it is larger than the sum of its proper divisors (1).

154481749 is an equidigital number, since it uses as much as digits as its factorization.

154481749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 161280, while the sum is 43.

The square root of 154481749 is about 12429.0687100844. The cubic root of 154481749 is about 536.5691828558.

The spelling of 154481749 in words is "one hundred fifty-four million, four hundred eighty-one thousand, seven hundred forty-nine".