1262991 has 4 divisors (see below), whose sum is σ = 1683992. Its totient is φ = 841992.

The previous prime is 1262957. The next prime is 1263007. The reversal of 1262991 is 1992621.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1262991 - 2⁶ = 1262927 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1262941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210496 + ... + 210501.

It is an arithmetic number, because the mean of its divisors is an integer number (420998).

2^1262991 is an apocalyptic number.

1262991 is a deficient number, since it is larger than the sum of its proper divisors (421001).

1262991 is an equidigital number, since it uses as much as digits as its factorization.

1262991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421000.

The product of its digits is 1944, while the sum is 30.

The square root of 1262991 is about 1123.8287236052. The cubic root of 1262991 is about 108.0936259446.

It can be divided in two parts, 12629 and 91, that added together give a triangular number (12720 = T₁₅₉).

The spelling of 1262991 in words is "one million, two hundred sixty-two thousand, nine hundred ninety-one".