155231550 has 36 divisors (see below), whose sum is σ = 417056640. Its totient is φ = 41394960.

The previous prime is 155231533. The next prime is 155231567. The reversal of 155231550 is 55132551.

155231550 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (155231533) and next prime (155231567).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 172030 + ... + 172929.

Almost surely, 2^155231550 is an apocalyptic number.

155231550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

155231550 is an abundant number, since it is smaller than the sum of its proper divisors (261825090).

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

155231550 is a wasteful number, since it uses less digits than its factorization.

155231550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344977 (or 344969 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 27.

The square root of 155231550 is about 12459.1953993827. The cubic root of 155231550 is about 537.4358892346.

The spelling of 155231550 in words is "one hundred fifty-five million, two hundred thirty-one thousand, five hundred fifty".