1551516161 has 12 divisors (see below), whose sum is σ = 1685831868. Its totient is φ = 1427235264.

The previous prime is 1551516149. The next prime is 1551516173. The reversal of 1551516161 is 1616151551.

It is an interprime number because it is at equal distance from previous prime (1551516149) and next prime (1551516173).

It can be written as a sum of positive squares in 6 ways, for example, as 107516161 + 1444000000 = 10369^2 + 38000^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1551516161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1551516191) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33851 + ... + 65183.

It is an arithmetic number, because the mean of its divisors is an integer number (140485989).

Almost surely, 2^1551516161 is an apocalyptic number.

It is an amenable number.

1551516161 is a deficient number, since it is larger than the sum of its proper divisors (134315707).

1551516161 is a wasteful number, since it uses less digits than its factorization.

1551516161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31652 (or 31639 counting only the distinct ones).

The product of its digits is 4500, while the sum is 32.

The square root of 1551516161 is about 39389.2899275933. The cubic root of 1551516161 is about 1157.6717472685.

The spelling of 1551516161 in words is "one billion, five hundred fifty-one million, five hundred sixteen thousand, one hundred sixty-one".