1261354001 has 2 divisors, whose sum is σ = 1261354002. Its totient is φ = 1261354000.

The previous prime is 1261353983. The next prime is 1261354033. The reversal of 1261354001 is 1004531621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1172994001 + 88360000 = 34249^2 + 9400^2 .

It is a cyclic number.

It is not a de Polignac number, because 1261354001 - 2⁶ = 1261353937 is a prime.

It is not a weakly prime, because it can be changed into another prime (1261354051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630677000 + 630677001.

It is an arithmetic number, because the mean of its divisors is an integer number (630677001).

Almost surely, 2^1261354001 is an apocalyptic number.

It is an amenable number.

1261354001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261354001 is an equidigital number, since it uses as much as digits as its factorization.

1261354001 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1261354001 is about 35515.5459059832. The cubic root of 1261354001 is about 1080.4690466625.

Adding to 1261354001 its reverse (1004531621), we get a palindrome (2265885622).

The spelling of 1261354001 in words is "one billion, two hundred sixty-one million, three hundred fifty-four thousand, one".