5151449561 has 4 divisors (see below), whose sum is σ = 5159104692. Its totient is φ = 5143794432.

The previous prime is 5151449557. The next prime is 5151449593. The reversal of 5151449561 is 1659441515.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1659441515 = 5 ⋅331888303.

It can be written as a sum of positive squares in 2 ways, for example, as 3425877961 + 1725571600 = 58531^2 + 41540^2 .

It is a cyclic number.

It is not a de Polignac number, because 5151449561 - 2² = 5151449557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5151449761) 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, 3826556 + ... + 3827901.

It is an arithmetic number, because the mean of its divisors is an integer number (1289776173).

Almost surely, 2^5151449561 is an apocalyptic number.

It is an amenable number.

5151449561 is a deficient number, since it is larger than the sum of its proper divisors (7655131).

5151449561 is an equidigital number, since it uses as much as digits as its factorization.

5151449561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7655130.

The product of its digits is 108000, while the sum is 41.

The square root of 5151449561 is about 71773.5993315091. The cubic root of 5151449561 is about 1727.0695106923.

The spelling of 5151449561 in words is "five billion, one hundred fifty-one million, four hundred forty-nine thousand, five hundred sixty-one".