1261739 has 2 divisors, whose sum is σ = 1261740. Its totient is φ = 1261738.

The previous prime is 1261721. The next prime is 1261747. The reversal of 1261739 is 9371621.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1261739 is a prime.

It is not a weakly prime, because it can be changed into another prime (1261759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630869 + 630870.

It is an arithmetic number, because the mean of its divisors is an integer number (630870).

2^1261739 is an apocalyptic number.

1261739 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261739 is an equidigital number, since it uses as much as digits as its factorization.

1261739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2268, while the sum is 29.

The square root of 1261739 is about 1123.2715611107. The cubic root of 1261739 is about 108.0578964837.

The spelling of 1261739 in words is "one million, two hundred sixty-one thousand, seven hundred thirty-nine".