145521715 has 8 divisors (see below), whose sum is σ = 174857760. Its totient is φ = 116262912.

The previous prime is 145521707. The next prime is 145521721. The reversal of 145521715 is 517125541.

145521715 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 145521715 - 2³ = 145521707 is a prime.

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, 15079 + ... + 22768.

It is an arithmetic number, because the mean of its divisors is an integer number (21857220).

Almost surely, 2^145521715 is an apocalyptic number.

145521715 is a deficient number, since it is larger than the sum of its proper divisors (29336045).

145521715 is an equidigital number, since it uses as much as digits as its factorization.

145521715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38621.

The product of its digits is 7000, while the sum is 31.

The square root of 145521715 is about 12063.2381639425. The cubic root of 145521715 is about 525.9881194095.

The spelling of 145521715 in words is "one hundred forty-five million, five hundred twenty-one thousand, seven hundred fifteen".