155290361 has 2 divisors, whose sum is σ = 155290362. Its totient is φ = 155290360.

The previous prime is 155290351. The next prime is 155290367. The reversal of 155290361 is 163092551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87310336 + 67980025 = 9344^2 + 8245^2 .

It is an emirp because it is prime and its reverse (163092551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155290361 - 2¹⁸ = 155028217 is a prime.

It is not a weakly prime, because it can be changed into another prime (155290367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77645180 + 77645181.

It is an arithmetic number, because the mean of its divisors is an integer number (77645181).

Almost surely, 2^155290361 is an apocalyptic number.

It is an amenable number.

155290361 is a deficient number, since it is larger than the sum of its proper divisors (1).

155290361 is an equidigital number, since it uses as much as digits as its factorization.

155290361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8100, while the sum is 32.

The square root of 155290361 is about 12461.5553202640. Note that the first 3 decimals coincide. The cubic root of 155290361 is about 537.5037516234.

The spelling of 155290361 in words is "one hundred fifty-five million, two hundred ninety thousand, three hundred sixty-one".