145221401 has 4 divisors (see below), whose sum is σ = 156392292. Its totient is φ = 134050512.

The previous prime is 145221367. The next prime is 145221413. The reversal of 145221401 is 104122541.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7182400 + 138039001 = 2680^2 + 11749^2 .

It is a cyclic number.

It is not a de Polignac number, because 145221401 - 2²⁶ = 78112537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145221421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5585426 + ... + 5585451.

It is an arithmetic number, because the mean of its divisors is an integer number (39098073).

Almost surely, 2^145221401 is an apocalyptic number.

It is an amenable number.

145221401 is a deficient number, since it is larger than the sum of its proper divisors (11170891).

145221401 is a wasteful number, since it uses less digits than its factorization.

145221401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11170890.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 145221401 is about 12050.7842483384. The cubic root of 145221401 is about 525.6260419860.

Adding to 145221401 its reverse (104122541), we get a palindrome (249343942).

The spelling of 145221401 in words is "one hundred forty-five million, two hundred twenty-one thousand, four hundred one".