1550158121 has 2 divisors, whose sum is σ = 1550158122. Its totient is φ = 1550158120.

The previous prime is 1550158097. The next prime is 1550158157. The reversal of 1550158121 is 1218510551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 912040000 + 638118121 = 30200^2 + 25261^2 .

It is a cyclic number.

It is not a de Polignac number, because 1550158121 - 2¹⁴ = 1550141737 is a prime.

It is not a weakly prime, because it can be changed into another prime (1550158171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775079060 + 775079061.

It is an arithmetic number, because the mean of its divisors is an integer number (775079061).

Almost surely, 2^1550158121 is an apocalyptic number.

It is an amenable number.

1550158121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1550158121 is an equidigital number, since it uses as much as digits as its factorization.

1550158121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2000, while the sum is 29.

The square root of 1550158121 is about 39372.0474575555. The cubic root of 1550158121 is about 1157.3338791652. Note that the first 3 decimals are identical.

Adding to 1550158121 its reverse (1218510551), we get a palindrome (2768668672).

The spelling of 1550158121 in words is "one billion, five hundred fifty million, one hundred fifty-eight thousand, one hundred twenty-one".