1256301161 has 8 divisors (see below), whose sum is σ = 1278683784. Its totient is φ = 1233976320.

The previous prime is 1256301157. The next prime is 1256301181. The reversal of 1256301161 is 1611036521.

It can be written as a sum of positive squares in 4 ways, for example, as 1795600 + 1254505561 = 1340^2 + 35419^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1256301161 - 2² = 1256301157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1256301161.

It is not an unprimeable number, because it can be changed into a prime (1256301181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30665 + ... + 58761.

It is an arithmetic number, because the mean of its divisors is an integer number (159835473).

Almost surely, 2^1256301161 is an apocalyptic number.

It is an amenable number.

1256301161 is a deficient number, since it is larger than the sum of its proper divisors (22382623).

1256301161 is an equidigital number, since it uses as much as digits as its factorization.

1256301161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28891.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 1256301161 is about 35444.3389132877. The cubic root of 1256301161 is about 1079.0243706923.

Adding to 1256301161 its reverse (1611036521), we get a palindrome (2867337682).

The spelling of 1256301161 in words is "one billion, two hundred fifty-six million, three hundred one thousand, one hundred sixty-one".