145521520 has 40 divisors (see below), whose sum is σ = 338839920. Its totient is φ = 58122240.

The previous prime is 145521499. The next prime is 145521557. The reversal of 145521520 is 25125541.

145521520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×145521520² = 42353025566220800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102576 + ... + 103984.

It is an arithmetic number, because the mean of its divisors is an integer number (8470998).

Almost surely, 2^145521520 is an apocalyptic number.

145521520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

145521520 is an abundant number, since it is smaller than the sum of its proper divisors (193318400).

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

145521520 is a wasteful number, since it uses less digits than its factorization.

145521520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2713 (or 2707 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 145521520 is about 12063.2300815329. The cubic root of 145521520 is about 525.9878844670.

The spelling of 145521520 in words is "one hundred forty-five million, five hundred twenty-one thousand, five hundred twenty".