38551621 has 2 divisors, whose sum is σ = 38551622. Its totient is φ = 38551620.

The previous prime is 38551577. The next prime is 38551633. The reversal of 38551621 is 12615583.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21986721 + 16564900 = 4689^2 + 4070^2 .

It is a cyclic number.

It is not a de Polignac number, because 38551621 - 2¹⁵ = 38518853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38551661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19275810 + 19275811.

It is an arithmetic number, because the mean of its divisors is an integer number (19275811).

Almost surely, 2^38551621 is an apocalyptic number.

It is an amenable number.

38551621 is a deficient number, since it is larger than the sum of its proper divisors (1).

38551621 is an equidigital number, since it uses as much as digits as its factorization.

38551621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 31.

The square root of 38551621 is about 6208.9951683022. The cubic root of 38551621 is about 337.8165180644.

It can be divided in two parts, 3855 and 1621, that added together give a square (5476 = 74²).

The spelling of 38551621 in words is "thirty-eight million, five hundred fifty-one thousand, six hundred twenty-one".