155203361 has 4 divisors (see below), whose sum is σ = 155232132. Its totient is φ = 155174592.

The previous prime is 155203283. The next prime is 155203417. The reversal of 155203361 is 163302551.

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 66259600 + 88943761 = 8140^2 + 9431^2 .

It is a cyclic number.

It is not a de Polignac number, because 155203361 - 2¹⁸ = 154941217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 155203361.

It is not an unprimeable number, because it can be changed into a prime (155203861) 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, 3596 + ... + 17981.

It is an arithmetic number, because the mean of its divisors is an integer number (38808033).

It is a Poulet number, since it divides 2^155203360-1.

Almost surely, 2^155203361 is an apocalyptic number.

155203361 is the 7193-rd octagonal number.

It is an amenable number.

155203361 is a deficient number, since it is larger than the sum of its proper divisors (28771).

155203361 is an equidigital number, since it uses as much as digits as its factorization.

155203361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28770.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 155203361 is about 12458.0640951955. The cubic root of 155203361 is about 537.4033556906.

It can be divided in two parts, 15520 and 3361, that added together give a palindrome (18881).

The spelling of 155203361 in words is "one hundred fifty-five million, two hundred three thousand, three hundred sixty-one".