155214809 has 2 divisors, whose sum is σ = 155214810. Its totient is φ = 155214808.

The previous prime is 155214803. The next prime is 155214817. The reversal of 155214809 is 908412551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131905225 + 23309584 = 11485^2 + 4828^2 .

It is an emirp because it is prime and its reverse (908412551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155214809 - 2¹⁶ = 155149273 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (155214803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77607404 + 77607405.

It is an arithmetic number, because the mean of its divisors is an integer number (77607405).

Almost surely, 2^155214809 is an apocalyptic number.

It is an amenable number.

155214809 is a deficient number, since it is larger than the sum of its proper divisors (1).

155214809 is an equidigital number, since it uses as much as digits as its factorization.

155214809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14400, while the sum is 35.

The square root of 155214809 is about 12458.5235481577. The cubic root of 155214809 is about 537.4165685538.

It can be divided in two parts, 1552 and 14809, that added together give a palindrome (16361).

The spelling of 155214809 in words is "one hundred fifty-five million, two hundred fourteen thousand, eight hundred nine".