145521201 has 8 divisors (see below), whose sum is σ = 221746624. Its totient is φ = 83154960.

The previous prime is 145521191. The next prime is 145521221. The reversal of 145521201 is 102125541.

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

It is not a de Polignac number, because 145521201 - 2⁵ = 145521169 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 6929581 = 145521201 / (1 + 4 + 5 + 5 + 2 + 1 + 2 + 0 + 1).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (145521221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3464770 + ... + 3464811.

It is an arithmetic number, because the mean of its divisors is an integer number (27718328).

Almost surely, 2^145521201 is an apocalyptic number.

It is an amenable number.

145521201 is a deficient number, since it is larger than the sum of its proper divisors (76225423).

145521201 is an equidigital number, since it uses as much as digits as its factorization.

145521201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6929591.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 145521201 is about 12063.2168595280. The cubic root of 145521201 is about 525.9875001246.

Adding to 145521201 its reverse (102125541), we get a palindrome (247646742).

It can be divided in two parts, 14552 and 1201, that added together give a triangular number (15753 = T₁₇₇).

The spelling of 145521201 in words is "one hundred forty-five million, five hundred twenty-one thousand, two hundred one".