1201729 has 2 divisors, whose sum is σ = 1201730. Its totient is φ = 1201728.

The previous prime is 1201709. The next prime is 1201787. The reversal of 1201729 is 9271021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1199025 + 2704 = 1095^2 + 52^2 .

It is an emirp because it is prime and its reverse (9271021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1201729 - 2⁷ = 1201601 is a prime.

1201729 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1201709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600864 + 600865.

It is an arithmetic number, because the mean of its divisors is an integer number (600865).

2^1201729 is an apocalyptic number.

It is an amenable number.

1201729 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201729 is an equidigital number, since it uses as much as digits as its factorization.

1201729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 1201729 is about 1096.2340078651. The cubic root of 1201729 is about 106.3168695555.

It can be divided in two parts, 120 and 1729, that added together give a square (1849 = 43²).

The spelling of 1201729 in words is "one million, two hundred one thousand, seven hundred twenty-nine".