155561300 has 18 divisors (see below), whose sum is σ = 337568238. Its totient is φ = 62224480.

The previous prime is 155561299. The next prime is 155561309. The reversal of 155561300 is 3165551.

It can be written as a sum of positive squares in 3 ways, for example, as 19465744 + 136095556 = 4412^2 + 11666^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 155561300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155561309) 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 in 5 ways as a sum of consecutive naturals, for example, 777707 + ... + 777906.

It is an arithmetic number, because the mean of its divisors is an integer number (18753791).

Almost surely, 2^155561300 is an apocalyptic number.

155561300 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155561300 is an abundant number, since it is smaller than the sum of its proper divisors (182006938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155561300 is a wasteful number, since it uses less digits than its factorization.

155561300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1555627 (or 1555620 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 26.

The square root of 155561300 is about 12472.4215772239. The cubic root of 155561300 is about 537.8161687728.

The spelling of 155561300 in words is "one hundred fifty-five million, five hundred sixty-one thousand, three hundred".