552971621 has 2 divisors, whose sum is σ = 552971622. Its totient is φ = 552971620.

The previous prime is 552971603. The next prime is 552971651. The reversal of 552971621 is 126179255.

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., 423330625 + 129640996 = 20575^2 + 11386^2 .

It is a cyclic number.

It is not a de Polignac number, because 552971621 - 2¹⁴ = 552955237 is a prime.

It is a super-2 number, since 2×552971621² = 611555227262735282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (552971651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 276485810 + 276485811.

It is an arithmetic number, because the mean of its divisors is an integer number (276485811).

Almost surely, 2^552971621 is an apocalyptic number.

It is an amenable number.

552971621 is a deficient number, since it is larger than the sum of its proper divisors (1).

552971621 is an equidigital number, since it uses as much as digits as its factorization.

552971621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37800, while the sum is 38.

The square root of 552971621 is about 23515.3486259507. The cubic root of 552971621 is about 820.7942042576.

The spelling of 552971621 in words is "five hundred fifty-two million, nine hundred seventy-one thousand, six hundred twenty-one".