1550208397 has 2 divisors, whose sum is σ = 1550208398. Its totient is φ = 1550208396.

The previous prime is 1550208383. The next prime is 1550208419. The reversal of 1550208397 is 7938020551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1533975556 + 16232841 = 39166^2 + 4029^2 .

It is an emirp because it is prime and its reverse (7938020551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1550208397 - 2⁷ = 1550208269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1550208307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775104198 + 775104199.

It is an arithmetic number, because the mean of its divisors is an integer number (775104199).

Almost surely, 2^1550208397 is an apocalyptic number.

It is an amenable number.

1550208397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1550208397 is an equidigital number, since it uses as much as digits as its factorization.

1550208397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75600, while the sum is 40.

The square root of 1550208397 is about 39372.6859256516. The cubic root of 1550208397 is about 1157.3463908973.

The spelling of 1550208397 in words is "one billion, five hundred fifty million, two hundred eight thousand, three hundred ninety-seven".