155440949 has 2 divisors, whose sum is σ = 155440950. Its totient is φ = 155440948.

The previous prime is 155440937. The next prime is 155440973. The reversal of 155440949 is 949044551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134142724 + 21298225 = 11582^2 + 4615^2 .

It is a cyclic number.

It is not a de Polignac number, because 155440949 - 2¹⁶ = 155375413 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155448949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77720474 + 77720475.

It is an arithmetic number, because the mean of its divisors is an integer number (77720475).

Almost surely, 2^155440949 is an apocalyptic number.

It is an amenable number.

155440949 is a deficient number, since it is larger than the sum of its proper divisors (1).

155440949 is an equidigital number, since it uses as much as digits as its factorization.

155440949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 155440949 is about 12467.5959591254. The cubic root of 155440949 is about 537.6774380110.

The spelling of 155440949 in words is "one hundred fifty-five million, four hundred forty thousand, nine hundred forty-nine".