145561201 has 4 divisors (see below), whose sum is σ = 148028400. Its totient is φ = 143094004.

The previous prime is 145561139. The next prime is 145561231. The reversal of 145561201 is 102165541.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 145561201 - 2²¹ = 143464049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145561231) 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 3 ways as a sum of consecutive naturals, for example, 1233511 + ... + 1233628.

It is an arithmetic number, because the mean of its divisors is an integer number (37007100).

Almost surely, 2^145561201 is an apocalyptic number.

It is an amenable number.

145561201 is a deficient number, since it is larger than the sum of its proper divisors (2467199).

145561201 is an equidigital number, since it uses as much as digits as its factorization.

145561201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2467198.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 145561201 is about 12064.8746781722. The cubic root of 145561201 is about 526.0356891455.

The spelling of 145561201 in words is "one hundred forty-five million, five hundred sixty-one thousand, two hundred one".