1261913 has 2 divisors, whose sum is σ = 1261914. Its totient is φ = 1261912.

The previous prime is 1261901. The next prime is 1261933. The reversal of 1261913 is 3191621.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1261129 + 784 = 1123^2 + 28^2 .

It is an emirp because it is prime and its reverse (3191621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1261913 - 2¹⁴ = 1245529 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1261933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630956 + 630957.

It is an arithmetic number, because the mean of its divisors is an integer number (630957).

2^1261913 is an apocalyptic number.

It is an amenable number.

1261913 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261913 is an equidigital number, since it uses as much as digits as its factorization.

1261913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 324, while the sum is 23.

The square root of 1261913 is about 1123.3490107709. The cubic root of 1261913 is about 108.0628634934.

The spelling of 1261913 in words is "one million, two hundred sixty-one thousand, nine hundred thirteen".