1261554353 has 2 divisors, whose sum is σ = 1261554354. Its totient is φ = 1261554352.

The previous prime is 1261554319. The next prime is 1261554383. The reversal of 1261554353 is 3534551621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 766625344 + 494929009 = 27688^2 + 22247^2 .

It is an emirp because it is prime and its reverse (3534551621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1261554353 - 2¹⁴ = 1261537969 is a prime.

It is not a weakly prime, because it can be changed into another prime (1261554383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630777176 + 630777177.

It is an arithmetic number, because the mean of its divisors is an integer number (630777177).

Almost surely, 2^1261554353 is an apocalyptic number.

It is an amenable number.

1261554353 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261554353 is an equidigital number, since it uses as much as digits as its factorization.

1261554353 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54000, while the sum is 35.

The square root of 1261554353 is about 35518.3664179534. The cubic root of 1261554353 is about 1080.5262504487.

The spelling of 1261554353 in words is "one billion, two hundred sixty-one million, five hundred fifty-four thousand, three hundred fifty-three".