1249991 has 4 divisors (see below), whose sum is σ = 1315800. Its totient is φ = 1184184.

The previous prime is 1249943. The next prime is 1249999. The reversal of 1249991 is 1999421.

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

It is a cyclic number.

It is not a de Polignac number, because 1249991 - 2¹⁴ = 1233607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1249999) 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, 32876 + ... + 32913.

It is an arithmetic number, because the mean of its divisors is an integer number (328950).

2^1249991 is an apocalyptic number.

1249991 is a deficient number, since it is larger than the sum of its proper divisors (65809).

1249991 is an equidigital number, since it uses as much as digits as its factorization.

1249991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65808.

The product of its digits is 5832, while the sum is 35.

The square root of 1249991 is about 1118.0299638203. The cubic root of 1249991 is about 107.7214759688.

It can be divided in two parts, 124999 and 1, that added together give a cube (125000 = 50³).

The spelling of 1249991 in words is "one million, two hundred forty-nine thousand, nine hundred ninety-one".