145302521 has 32 divisors (see below), whose sum is σ = 186375168. Its totient is φ = 110223360.

The previous prime is 145302497. The next prime is 145302529. The reversal of 145302521 is 125203541.

145302521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 145302521 - 2⁶ = 145302457 is a prime.

It is a super-2 number, since 2×145302521² = 42225645217910882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (145302529) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 226361 + ... + 227001.

It is an arithmetic number, because the mean of its divisors is an integer number (5824224).

Almost surely, 2^145302521 is an apocalyptic number.

It is an amenable number.

145302521 is a deficient number, since it is larger than the sum of its proper divisors (41072647).

145302521 is a wasteful number, since it uses less digits than its factorization.

145302521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 145302521 is about 12054.1495344964. The cubic root of 145302521 is about 525.7238945233.

The spelling of 145302521 in words is "one hundred forty-five million, three hundred two thousand, five hundred twenty-one".