37228621 has 2 divisors, whose sum is σ = 37228622. Its totient is φ = 37228620.

The previous prime is 37228579. The next prime is 37228649. The reversal of 37228621 is 12682273.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37039396 + 189225 = 6086^2 + 435^2 .

It is an emirp because it is prime and its reverse (12682273) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 37228621 - 2⁹ = 37228109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (37228661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18614310 + 18614311.

It is an arithmetic number, because the mean of its divisors is an integer number (18614311).

Almost surely, 2^37228621 is an apocalyptic number.

It is an amenable number.

37228621 is a deficient number, since it is larger than the sum of its proper divisors (1).

37228621 is an equidigital number, since it uses as much as digits as its factorization.

37228621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 31.

The square root of 37228621 is about 6101.5261205702. The cubic root of 37228621 is about 333.9070970412.

The spelling of 37228621 in words is "thirty-seven million, two hundred twenty-eight thousand, six hundred twenty-one".