155242237 has 2 divisors, whose sum is σ = 155242238. Its totient is φ = 155242236.

The previous prime is 155242229. The next prime is 155242259. The reversal of 155242237 is 732242551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81522841 + 73719396 = 9029^2 + 8586^2 .

It is a cyclic number.

It is not a de Polignac number, because 155242237 - 2³ = 155242229 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 155242199 and 155242208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155242207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77621118 + 77621119.

It is an arithmetic number, because the mean of its divisors is an integer number (77621119).

Almost surely, 2^155242237 is an apocalyptic number.

It is an amenable number.

155242237 is a deficient number, since it is larger than the sum of its proper divisors (1).

155242237 is an equidigital number, since it uses as much as digits as its factorization.

155242237 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16800, while the sum is 31.

The square root of 155242237 is about 12459.6242720236. The cubic root of 155242237 is about 537.4482223064.

Adding to 155242237 its reverse (732242551), we get a palindrome (887484788).

The spelling of 155242237 in words is "one hundred fifty-five million, two hundred forty-two thousand, two hundred thirty-seven".