145365521 has 8 divisors (see below), whose sum is σ = 175904640. Its totient is φ = 117269568.

The previous prime is 145365511. The next prime is 145365529. The reversal of 145365521 is 125563541.

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 145365521 - 2¹⁴ = 145349137 is a prime.

It is a super-2 number, since 2×145365521² = 42262269391202882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (145365529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 610661 + ... + 610898.

It is an arithmetic number, because the mean of its divisors is an integer number (21988080).

Almost surely, 2^145365521 is an apocalyptic number.

It is an amenable number.

145365521 is a deficient number, since it is larger than the sum of its proper divisors (30539119).

145365521 is a wasteful number, since it uses less digits than its factorization.

145365521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1221583.

The product of its digits is 18000, while the sum is 32.

The square root of 145365521 is about 12056.7624593006. The cubic root of 145365521 is about 525.7998643448.

The spelling of 145365521 in words is "one hundred forty-five million, three hundred sixty-five thousand, five hundred twenty-one".