1261993 has 4 divisors (see below), whose sum is σ = 1305540. Its totient is φ = 1218448.

The previous prime is 1261973. The next prime is 1262011. The reversal of 1261993 is 3991621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3991621 = 101 ⋅39521.

It can be written as a sum of positive squares in 2 ways, for example, as 205209 + 1056784 = 453^2 + 1028^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1261993 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1261913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21730 + ... + 21787.

It is an arithmetic number, because the mean of its divisors is an integer number (326385).

2^1261993 is an apocalyptic number.

It is an amenable number.

1261993 is a deficient number, since it is larger than the sum of its proper divisors (43547).

1261993 is an equidigital number, since it uses as much as digits as its factorization.

1261993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43546.

The product of its digits is 2916, while the sum is 31.

The square root of 1261993 is about 1123.3846180182. The cubic root of 1261993 is about 108.0651470229.

The spelling of 1261993 in words is "one million, two hundred sixty-one thousand, nine hundred ninety-three".