1550533993 has 2 divisors, whose sum is σ = 1550533994. Its totient is φ = 1550533992.

The previous prime is 1550533973. The next prime is 1550534003. The reversal of 1550533993 is 3993350551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1423024729 + 127509264 = 37723^2 + 11292^2 .

It is a cyclic number.

It is not a de Polignac number, because 1550533993 - 2¹⁷ = 1550402921 is a prime.

It is not a weakly prime, because it can be changed into another prime (1550533903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775266996 + 775266997.

It is an arithmetic number, because the mean of its divisors is an integer number (775266997).

Almost surely, 2^1550533993 is an apocalyptic number.

It is an amenable number.

1550533993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1550533993 is an equidigital number, since it uses as much as digits as its factorization.

1550533993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 273375, while the sum is 43.

The square root of 1550533993 is about 39376.8205039462. The cubic root of 1550533993 is about 1157.4274124720.

The spelling of 1550533993 in words is "one billion, five hundred fifty million, five hundred thirty-three thousand, nine hundred ninety-three".