155601000 has 320 divisors, whose sum is σ = 581003280. Its totient is φ = 38707200.

The previous prime is 155600981. The next prime is 155601023. The reversal of 155601000 is 106551.

155601000 is a `hidden beast` number, since 1 + 5 + 560 + 100 + 0 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 324 + 155600676 = 18^2 + 12474^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1376944 + ... + 1377056.

Almost surely, 2^155601000 is an apocalyptic number.

155601000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155601000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (290501640).

155601000 is an abundant number, since it is smaller than the sum of its proper divisors (425402280).

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

155601000 is a wasteful number, since it uses less digits than its factorization.

155601000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163 (or 140 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 155601000 is about 12474.0129870062. The cubic root of 155601000 is about 537.8619159817.

Adding to 155601000 its reverse (106551), we get a palindrome (155707551).

The spelling of 155601000 in words is "one hundred fifty-five million, six hundred one thousand".