155551000 has 128 divisors (see below), whose sum is σ = 404352000. Its totient is φ = 55536000.

The previous prime is 155550991. The next prime is 155551021. The reversal of 155551000 is 155551.

It is a super-2 number, since 2×155551000² = 48392227202000000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 868911 + ... + 869089.

It is an arithmetic number, because the mean of its divisors is an integer number (3159000).

Almost surely, 2^155551000 is an apocalyptic number.

155551000 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 155551000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (202176000).

155551000 is an abundant number, since it is smaller than the sum of its proper divisors (248801000).

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

155551000 is a wasteful number, since it uses less digits than its factorization.

155551000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290 (or 276 counting only the distinct ones).

The product of its (nonzero) digits is 625, while the sum is 22.

The square root of 155551000 is about 12472.0086593940. The cubic root of 155551000 is about 537.8042985780.

155551000 divided by its reverse (155551) gives a cube (1000 = 10³).

It can be divided in two parts, 155 and 551000, that added together give a palindrome (551155).

The spelling of 155551000 in words is "one hundred fifty-five million, five hundred fifty-one thousand".