145121242 has 40 divisors (see below), whose sum is σ = 259753536. Its totient is φ = 60776856.

The previous prime is 145121209. The next prime is 145121243. The reversal of 145121242 is 242121541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145121243) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 225373 + ... + 226015.

Almost surely, 2^145121242 is an apocalyptic number.

145121242 is a deficient number, since it is larger than the sum of its proper divisors (114632294).

145121242 is an frugal number, since it uses more digits than its factorization.

145121242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720 (or 699 counting only the distinct ones).

The product of its digits is 640, while the sum is 22.

The square root of 145121242 is about 12046.6278269066. The cubic root of 145121242 is about 525.5051730085.

Adding to 145121242 its reverse (242121541), we get a palindrome (387242783).

The spelling of 145121242 in words is "one hundred forty-five million, one hundred twenty-one thousand, two hundred forty-two".