1256130401 has 2 divisors, whose sum is σ = 1256130402. Its totient is φ = 1256130400.

The previous prime is 1256130397. The next prime is 1256130433. The reversal of 1256130401 is 1040316521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 998560000 + 257570401 = 31600^2 + 16049^2 .

It is an emirp because it is prime and its reverse (1040316521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1256130401 - 2² = 1256130397 is a prime.

It is not a weakly prime, because it can be changed into another prime (1256130461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628065200 + 628065201.

It is an arithmetic number, because the mean of its divisors is an integer number (628065201).

Almost surely, 2^1256130401 is an apocalyptic number.

It is an amenable number.

1256130401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256130401 is an equidigital number, since it uses as much as digits as its factorization.

1256130401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 1256130401 is about 35441.9299841304. The cubic root of 1256130401 is about 1078.9754804644.

Adding to 1256130401 its reverse (1040316521), we get a palindrome (2296446922).

The spelling of 1256130401 in words is "one billion, two hundred fifty-six million, one hundred thirty thousand, four hundred one".