145391550 has 48 divisors (see below), whose sum is σ = 372214272. Its totient is φ = 37519200.

The previous prime is 145391549. The next prime is 145391569. The reversal of 145391550 is 55193541.

It is a super-2 number, since 2×145391550² = 42277405622805000, which contains 22 as substring.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10984 + ... + 20283.

It is an arithmetic number, because the mean of its divisors is an integer number (7754464).

Almost surely, 2^145391550 is an apocalyptic number.

145391550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

145391550 is an abundant number, since it is smaller than the sum of its proper divisors (226822722).

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

145391550 is a wasteful number, since it uses less digits than its factorization.

145391550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31313 (or 31308 counting only the distinct ones).

The product of its (nonzero) digits is 13500, while the sum is 33.

The square root of 145391550 is about 12057.8418466988. The cubic root of 145391550 is about 525.8312455320.

The spelling of 145391550 in words is "one hundred forty-five million, three hundred ninety-one thousand, five hundred fifty".