1355240729 has 2 divisors, whose sum is σ = 1355240730. Its totient is φ = 1355240728.

The previous prime is 1355240633. The next prime is 1355240737. The reversal of 1355240729 is 9270425531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1044776329 + 310464400 = 32323^2 + 17620^2 .

It is a cyclic number.

It is not a de Polignac number, because 1355240729 - 2⁸ = 1355240473 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1355240692 and 1355240701.

It is not a weakly prime, because it can be changed into another prime (1355240779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 677620364 + 677620365.

It is an arithmetic number, because the mean of its divisors is an integer number (677620365).

Almost surely, 2^1355240729 is an apocalyptic number.

It is an amenable number.

1355240729 is a deficient number, since it is larger than the sum of its proper divisors (1).

1355240729 is an equidigital number, since it uses as much as digits as its factorization.

1355240729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75600, while the sum is 38.

The square root of 1355240729 is about 36813.5943504570. The cubic root of 1355240729 is about 1106.6377518917.

The spelling of 1355240729 in words is "one billion, three hundred fifty-five million, two hundred forty thousand, seven hundred twenty-nine".