145406521 has 16 divisors (see below), whose sum is σ = 160864704. Its totient is φ = 130584384.

The previous prime is 145406477. The next prime is 145406557. The reversal of 145406521 is 125604541.

145406521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 145406521 - 2²⁵ = 111852089 is a prime.

It is a super-2 number, since 2×145406521² = 42286112698646882, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 145406521.

It is not an unprimeable number, because it can be changed into a prime (145406561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 260775 + ... + 261331.

It is an arithmetic number, because the mean of its divisors is an integer number (10054044).

Almost surely, 2^145406521 is an apocalyptic number.

It is an amenable number.

145406521 is a deficient number, since it is larger than the sum of its proper divisors (15458183).

145406521 is a wasteful number, since it uses less digits than its factorization.

145406521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 145406521 is about 12058.4626300370. The cubic root of 145406521 is about 525.8492932323.

The spelling of 145406521 in words is "one hundred forty-five million, four hundred six thousand, five hundred twenty-one".