1551156161 has 6 divisors (see below), whose sum is σ = 1558587186. Its totient is φ = 1543760400.

The previous prime is 1551156151. The next prime is 1551156163. The reversal of 1551156161 is 1616511551.

It can be written as a sum of positive squares in only one way, i.e., 1069617025 + 481539136 = 32705^2 + 21944^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1551156161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1551156163) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27101 + ... + 61941.

It is an arithmetic number, because the mean of its divisors is an integer number (259764531).

Almost surely, 2^1551156161 is an apocalyptic number.

It is an amenable number.

1551156161 is a deficient number, since it is larger than the sum of its proper divisors (7431025).

1551156161 is an frugal number, since it uses more digits than its factorization.

1551156161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35263 (or 35052 counting only the distinct ones).

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

The square root of 1551156161 is about 39384.7198923643. The cubic root of 1551156161 is about 1157.5822017264.

The spelling of 1551156161 in words is "one billion, five hundred fifty-one million, one hundred fifty-six thousand, one hundred sixty-one".