145023401 has 4 divisors (see below), whose sum is σ = 145054404. Its totient is φ = 144992400.

The previous prime is 145023397. The next prime is 145023407. The reversal of 145023401 is 104320541.

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 43033600 + 101989801 = 6560^2 + 10099^2 .

It is a cyclic number.

It is not a de Polignac number, because 145023401 - 2² = 145023397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (145023407) 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, 6890 + ... + 18371.

It is an arithmetic number, because the mean of its divisors is an integer number (36263601).

Almost surely, 2^145023401 is an apocalyptic number.

It is an amenable number.

145023401 is a deficient number, since it is larger than the sum of its proper divisors (31003).

145023401 is an equidigital number, since it uses as much as digits as its factorization.

145023401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31002.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 145023401 is about 12042.5662132288. The cubic root of 145023401 is about 525.3870476164.

Adding to 145023401 its reverse (104320541), we get a palindrome (249343942).

The spelling of 145023401 in words is "one hundred forty-five million, twenty-three thousand, four hundred one".