1261129 has 3 divisors (see below), whose sum is σ = 1262253.
Its totient is φ = 1260006.
The previous prime is 1261121. The next prime is 1261133. The reversal of 1261129 is 9211621.
The square root of 1261129 is 1123.
It is a perfect power (a square), and thus also a powerful number.
It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9211621 = 683 ⋅13487.
It is not a de Polignac number, because 1261129 - 23 = 1261121 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (1261121) 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 2 ways as a sum of consecutive naturals, for example, 562 + ... + 1684.
It is an arithmetic number, because the mean of its divisors is an integer number (420751).
21261129 is an apocalyptic number.
1261129 is the 1123-rd square number.
1261129 is the 562-nd centered octagonal number.
It is an amenable number.
1261129 is a deficient number, since it is larger than the sum of its proper divisors (1124).
1261129 is an frugal number, since it uses more digits than its factorization.
1261129 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 2246 (or 1123 counting only the distinct ones).
The product of its digits is 216, while the sum is 22.
The cubic root of 1261129 is about 108.0404797960.
The spelling of 1261129 in words is "one million, two hundred sixty-one thousand, one hundred twenty-nine".