155343985 has 4 divisors (see below), whose sum is σ = 186412788. Its totient is φ = 124275184.

The previous prime is 155343983. The next prime is 155344009. The reversal of 155343985 is 589343551.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47100769 + 108243216 = 6863^2 + 10404^2 .

It is a cyclic number.

It is not a de Polignac number, because 155343985 - 2¹ = 155343983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155343983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15534394 + ... + 15534403.

It is an arithmetic number, because the mean of its divisors is an integer number (46603197).

Almost surely, 2^155343985 is an apocalyptic number.

It is an amenable number.

155343985 is a deficient number, since it is larger than the sum of its proper divisors (31068803).

155343985 is an equidigital number, since it uses as much as digits as its factorization.

155343985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31068802.

The product of its digits is 324000, while the sum is 43.

The square root of 155343985 is about 12463.7067118895. The cubic root of 155343985 is about 537.5656137676.

The spelling of 155343985 in words is "one hundred fifty-five million, three hundred forty-three thousand, nine hundred eighty-five".