7471621 has 2 divisors, whose sum is σ = 7471622. Its totient is φ = 7471620.

The previous prime is 7471603. The next prime is 7471649. The reversal of 7471621 is 1261747.

It is an a-pointer prime, because the next prime (7471649) can be obtained adding 7471621 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5354596 + 2117025 = 2314^2 + 1455^2 .

It is an emirp because it is prime and its reverse (1261747) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7471621 - 2¹³ = 7463429 is a prime.

7471621 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 7471621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7471601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3735810 + 3735811.

It is an arithmetic number, because the mean of its divisors is an integer number (3735811).

Almost surely, 2^7471621 is an apocalyptic number.

It is an amenable number.

7471621 is a deficient number, since it is larger than the sum of its proper divisors (1).

7471621 is an equidigital number, since it uses as much as digits as its factorization.

7471621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2352, while the sum is 28.

The square root of 7471621 is about 2733.4266040997. The cubic root of 7471621 is about 195.4961810510.

The spelling of 7471621 in words is "seven million, four hundred seventy-one thousand, six hundred twenty-one".