4172621 has 2 divisors, whose sum is σ = 4172622. Its totient is φ = 4172620.

The previous prime is 4172579. The next prime is 4172627. The reversal of 4172621 is 1262714.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3960100 + 212521 = 1990^2 + 461^2 .

It is a cyclic number.

It is not a de Polignac number, because 4172621 - 2¹⁸ = 3910477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4172627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2086310 + 2086311.

It is an arithmetic number, because the mean of its divisors is an integer number (2086311).

Almost surely, 2^4172621 is an apocalyptic number.

It is an amenable number.

4172621 is a deficient number, since it is larger than the sum of its proper divisors (1).

4172621 is an equidigital number, since it uses as much as digits as its factorization.

4172621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672, while the sum is 23.

The square root of 4172621 is about 2042.6994394673. The cubic root of 4172621 is about 160.9915122257.

The spelling of 4172621 in words is "four million, one hundred seventy-two thousand, six hundred twenty-one".