1261949 has 4 divisors (see below), whose sum is σ = 1359036. Its totient is φ = 1164864.

The previous prime is 1261943. The next prime is 1261963. The reversal of 1261949 is 9491621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9491621 = 19 ⋅499559.

It can be written as a sum of positive squares in 2 ways, for example, as 688900 + 573049 = 830^2 + 757^2 .

It is a cyclic number.

It is not a de Polignac number, because 1261949 - 2⁴ = 1261933 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261943) 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, 48524 + ... + 48549.

It is an arithmetic number, because the mean of its divisors is an integer number (339759).

2^1261949 is an apocalyptic number.

It is an amenable number.

1261949 is a deficient number, since it is larger than the sum of its proper divisors (97087).

1261949 is an equidigital number, since it uses as much as digits as its factorization.

1261949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97086.

The product of its digits is 3888, while the sum is 32.

The square root of 1261949 is about 1123.3650341719. The cubic root of 1261949 is about 108.0638910936.

The spelling of 1261949 in words is "one million, two hundred sixty-one thousand, nine hundred forty-nine".