1550199997 has 2 divisors, whose sum is σ = 1550199998. Its totient is φ = 1550199996.

The previous prime is 1550199983. The next prime is 1550200019. The reversal of 1550199997 is 7999910551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 911677636 + 638522361 = 30194^2 + 25269^2 .

It is a cyclic number.

It is not a de Polignac number, because 1550199997 - 2⁷ = 1550199869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1550199907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775099998 + 775099999.

It is an arithmetic number, because the mean of its divisors is an integer number (775099999).

Almost surely, 2^1550199997 is an apocalyptic number.

It is an amenable number.

1550199997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1550199997 is an equidigital number, since it uses as much as digits as its factorization.

1550199997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1148175, while the sum is 55.

The square root of 1550199997 is about 39372.5792525712. The cubic root of 1550199997 is about 1157.3443004843.

The spelling of 1550199997 in words is "one billion, five hundred fifty million, one hundred ninety-nine thousand, nine hundred ninety-seven".