155185489 has 2 divisors, whose sum is σ = 155185490. Its totient is φ = 155185488.

The previous prime is 155185463. The next prime is 155185549. The reversal of 155185489 is 984581551.

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., 148425489 + 6760000 = 12183^2 + 2600^2 .

It is a cyclic number.

It is not a de Polignac number, because 155185489 - 2²¹ = 153088337 is a prime.

It is not a weakly prime, because it can be changed into another prime (155165489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77592744 + 77592745.

It is an arithmetic number, because the mean of its divisors is an integer number (77592745).

Almost surely, 2^155185489 is an apocalyptic number.

It is an amenable number.

155185489 is a deficient number, since it is larger than the sum of its proper divisors (1).

155185489 is an equidigital number, since it uses as much as digits as its factorization.

155185489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288000, while the sum is 46.

The square root of 155185489 is about 12457.3467881407. The cubic root of 155185489 is about 537.3827271823.

The spelling of 155185489 in words is "one hundred fifty-five million, one hundred eighty-five thousand, four hundred eighty-nine".