1261948577 has 2 divisors, whose sum is σ = 1261948578. Its totient is φ = 1261948576.

The previous prime is 1261948559. The next prime is 1261948609. The reversal of 1261948577 is 7758491621.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 729216016 + 532732561 = 27004^2 + 23081^2 .

It is a cyclic number.

It is not a de Polignac number, because 1261948577 - 2⁸ = 1261948321 is a prime.

It is not a weakly prime, because it can be changed into another prime (1261948507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630974288 + 630974289.

It is an arithmetic number, because the mean of its divisors is an integer number (630974289).

Almost surely, 2^1261948577 is an apocalyptic number.

It is an amenable number.

1261948577 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261948577 is an equidigital number, since it uses as much as digits as its factorization.

1261948577 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 846720, while the sum is 50.

The square root of 1261948577 is about 35523.9155640253. The cubic root of 1261948577 is about 1080.6387901943.

The spelling of 1261948577 in words is "one billion, two hundred sixty-one million, nine hundred forty-eight thousand, five hundred seventy-seven".