155405249 has 2 divisors, whose sum is σ = 155405250. Its totient is φ = 155405248.

The previous prime is 155405219. The next prime is 155405309. The reversal of 155405249 is 942504551.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139405249 + 16000000 = 11807^2 + 4000^2 .

It is an emirp because it is prime and its reverse (942504551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155405249 - 2¹² = 155401153 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (155405219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77702624 + 77702625.

It is an arithmetic number, because the mean of its divisors is an integer number (77702625).

Almost surely, 2^155405249 is an apocalyptic number.

It is an amenable number.

155405249 is a deficient number, since it is larger than the sum of its proper divisors (1).

155405249 is an equidigital number, since it uses as much as digits as its factorization.

155405249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36000, while the sum is 35.

The square root of 155405249 is about 12466.1641654520. The cubic root of 155405249 is about 537.6362722084.

The spelling of 155405249 in words is "one hundred fifty-five million, four hundred five thousand, two hundred forty-nine".