1261149 has 4 divisors (see below), whose sum is σ = 1681536. Its totient is φ = 840764.

The previous prime is 1261133. The next prime is 1261157. The reversal of 1261149 is 9411621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1261149 - 2⁴ = 1261133 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210189 + ... + 210194.

It is an arithmetic number, because the mean of its divisors is an integer number (420384).

2^1261149 is an apocalyptic number.

It is an amenable number.

1261149 is a deficient number, since it is larger than the sum of its proper divisors (420387).

1261149 is an equidigital number, since it uses as much as digits as its factorization.

1261149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420386.

The product of its digits is 432, while the sum is 24.

The square root of 1261149 is about 1123.0089046842. The cubic root of 1261149 is about 108.0410509240.

It can be divided in two parts, 126 and 1149, that added together give a triangular number (1275 = T₅₀).

The spelling of 1261149 in words is "one million, two hundred sixty-one thousand, one hundred forty-nine".