145241621 has 4 divisors (see below), whose sum is σ = 165990432. Its totient is φ = 124492812.

The previous prime is 145241611. The next prime is 145241627. The reversal of 145241621 is 126142541.

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 a de Polignac number, because none of the positive numbers 2^k-145241621 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145241627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10374395 + ... + 10374408.

It is an arithmetic number, because the mean of its divisors is an integer number (41497608).

Almost surely, 2^145241621 is an apocalyptic number.

It is an amenable number.

145241621 is a deficient number, since it is larger than the sum of its proper divisors (20748811).

145241621 is an equidigital number, since it uses as much as digits as its factorization.

145241621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20748810.

The product of its digits is 1920, while the sum is 26.

The square root of 145241621 is about 12051.6231686856. The cubic root of 145241621 is about 525.6504361530.

The spelling of 145241621 in words is "one hundred forty-five million, two hundred forty-one thousand, six hundred twenty-one".