154440749 has 2 divisors, whose sum is σ = 154440750. Its totient is φ = 154440748.

The previous prime is 154440719. The next prime is 154440779. The reversal of 154440749 is 947044451.

It is a balanced prime because it is at equal distance from previous prime (154440719) and next prime (154440779).

It can be written as a sum of positive squares in only one way, i.e., 151044100 + 3396649 = 12290^2 + 1843^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-154440749 is a prime.

It is a super-3 number, since 3×154440749³ (a number of 26 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (154440719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77220374 + 77220375.

It is an arithmetic number, because the mean of its divisors is an integer number (77220375).

Almost surely, 2^154440749 is an apocalyptic number.

It is an amenable number.

154440749 is a deficient number, since it is larger than the sum of its proper divisors (1).

154440749 is an equidigital number, since it uses as much as digits as its factorization.

154440749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 154440749 is about 12427.4192413389. The cubic root of 154440749 is about 536.5217095391.

The spelling of 154440749 in words is "one hundred fifty-four million, four hundred forty thousand, seven hundred forty-nine".