155231500 has 24 divisors (see below), whose sum is σ = 339026688. Its totient is φ = 62092400.

The previous prime is 155231441. The next prime is 155231509. The reversal of 155231500 is 5132551.

It is not an unprimeable number, because it can be changed into a prime (155231509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154732 + ... + 155731.

It is an arithmetic number, because the mean of its divisors is an integer number (14126112).

Almost surely, 2^155231500 is an apocalyptic number.

155231500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155231500 is an abundant number, since it is smaller than the sum of its proper divisors (183795188).

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

155231500 is a wasteful number, since it uses less digits than its factorization.

155231500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310482 (or 310470 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 155231500 is about 12459.1933928325. The cubic root of 155231500 is about 537.4358315320.

The spelling of 155231500 in words is "one hundred fifty-five million, two hundred thirty-one thousand, five hundred".