550401521 has 2 divisors, whose sum is σ = 550401522. Its totient is φ = 550401520.

The previous prime is 550401517. The next prime is 550401547. The reversal of 550401521 is 125104055.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 401561521 + 148840000 = 20039^2 + 12200^2 .

It is a cyclic number.

It is not a de Polignac number, because 550401521 - 2² = 550401517 is a prime.

It is a super-2 number, since 2×550401521² = 605883668638226882, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (550401581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275200760 + 275200761.

It is an arithmetic number, because the mean of its divisors is an integer number (275200761).

Almost surely, 2^550401521 is an apocalyptic number.

It is an amenable number.

550401521 is a deficient number, since it is larger than the sum of its proper divisors (1).

550401521 is an equidigital number, since it uses as much as digits as its factorization.

550401521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 550401521 is about 23460.6376938053. The cubic root of 550401521 is about 819.5206007059.

Adding to 550401521 its reverse (125104055), we get a palindrome (675505576).

The spelling of 550401521 in words is "five hundred fifty million, four hundred one thousand, five hundred twenty-one".