1516422121 has 2 divisors, whose sum is σ = 1516422122. Its totient is φ = 1516422120.

The previous prime is 1516422109. The next prime is 1516422157. The reversal of 1516422121 is 1212246151.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1516245721 + 176400 = 38939^2 + 420^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1516422121 is a prime.

It is not a weakly prime, because it can be changed into another prime (1516422221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 758211060 + 758211061.

It is an arithmetic number, because the mean of its divisors is an integer number (758211061).

Almost surely, 2^1516422121 is an apocalyptic number.

It is an amenable number.

1516422121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1516422121 is an equidigital number, since it uses as much as digits as its factorization.

1516422121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960, while the sum is 25.

The square root of 1516422121 is about 38941.2650154049. The cubic root of 1516422121 is about 1148.8765641196.

Adding to 1516422121 its reverse (1212246151), we get a palindrome (2728668272).

The spelling of 1516422121 in words is "one billion, five hundred sixteen million, four hundred twenty-two thousand, one hundred twenty-one".