1550606621 has 2 divisors, whose sum is σ = 1550606622. Its totient is φ = 1550606620.

The previous prime is 1550606591. The next prime is 1550606623. The reversal of 1550606621 is 1266060551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 974126521 + 576480100 = 31211^2 + 24010^2 .

It is a cyclic number.

It is not a de Polignac number, because 1550606621 - 2¹⁰ = 1550605597 is a prime.

Together with 1550606623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1550606623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775303310 + 775303311.

It is an arithmetic number, because the mean of its divisors is an integer number (775303311).

Almost surely, 2^1550606621 is an apocalyptic number.

It is an amenable number.

1550606621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1550606621 is an equidigital number, since it uses as much as digits as its factorization.

1550606621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 1550606621 is about 39377.7427108259. The cubic root of 1550606621 is about 1157.4454837356.

The spelling of 1550606621 in words is "one billion, five hundred fifty million, six hundred six thousand, six hundred twenty-one".