272145621 has 16 divisors (see below), whose sum is σ = 408619008. Its totient is φ = 159615600.

The previous prime is 272145617. The next prime is 272145647. The reversal of 272145621 is 126541272.

It is not a de Polignac number, because 272145621 - 2² = 272145617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (272145691) 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 15 ways as a sum of consecutive naturals, for example, 131991 + ... + 134036.

It is an arithmetic number, because the mean of its divisors is an integer number (25538688).

Almost surely, 2^272145621 is an apocalyptic number.

It is an amenable number.

272145621 is a deficient number, since it is larger than the sum of its proper divisors (136473387).

272145621 is a wasteful number, since it uses less digits than its factorization.

272145621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266072.

The product of its digits is 6720, while the sum is 30.

The square root of 272145621 is about 16496.8366967731. The cubic root of 272145621 is about 648.0379659778.

Adding to 272145621 its reverse (126541272), we get a palindrome (398686893).

The spelling of 272145621 in words is "two hundred seventy-two million, one hundred forty-five thousand, six hundred twenty-one".