1516801849 has 4 divisors (see below), whose sum is σ = 1516881636. Its totient is φ = 1516722064.

The previous prime is 1516801801. The next prime is 1516801903. The reversal of 1516801849 is 9481086151.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1158381225 + 358420624 = 34035^2 + 18932^2 .

It is a cyclic number.

It is not a de Polignac number, because 1516801849 - 2⁷ = 1516801721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1516801549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6987 + ... + 55519.

It is an arithmetic number, because the mean of its divisors is an integer number (379220409).

Almost surely, 2^1516801849 is an apocalyptic number.

It is an amenable number.

1516801849 is a deficient number, since it is larger than the sum of its proper divisors (79787).

1516801849 is an equidigital number, since it uses as much as digits as its factorization.

1516801849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79786.

The product of its (nonzero) digits is 69120, while the sum is 43.

The square root of 1516801849 is about 38946.1403607598. The cubic root of 1516801849 is about 1148.9724530291.

The spelling of 1516801849 in words is "one billion, five hundred sixteen million, eight hundred one thousand, eight hundred forty-nine".