1516649881 has 2 divisors, whose sum is σ = 1516649882. Its totient is φ = 1516649880.

The previous prime is 1516649867. The next prime is 1516649933. The reversal of 1516649881 is 1889466151.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1427630656 + 89019225 = 37784^2 + 9435^2 .

It is a cyclic number.

It is not a de Polignac number, because 1516649881 - 2⁷ = 1516649753 is a prime.

It is a super-2 number, since 2×1516649881² = 4600453723074628322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1516649851) 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, 758324940 + 758324941.

It is an arithmetic number, because the mean of its divisors is an integer number (758324941).

Almost surely, 2^1516649881 is an apocalyptic number.

It is an amenable number.

1516649881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1516649881 is an equidigital number, since it uses as much as digits as its factorization.

1516649881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 414720, while the sum is 49.

The square root of 1516649881 is about 38944.1893098316. The cubic root of 1516649881 is about 1148.9340799928.

The spelling of 1516649881 in words is "one billion, five hundred sixteen million, six hundred forty-nine thousand, eight hundred eighty-one".