1261851 has 8 divisors (see below), whose sum is σ = 1698624. Its totient is φ = 833160.

The previous prime is 1261837. The next prime is 1261861. The reversal of 1261851 is 1581621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1261851 - 2¹⁰ = 1260827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1261801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1645 + ... + 2286.

It is an arithmetic number, because the mean of its divisors is an integer number (212328).

2^1261851 is an apocalyptic number.

1261851 is a deficient number, since it is larger than the sum of its proper divisors (436773).

1261851 is a wasteful number, since it uses less digits than its factorization.

1261851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4041.

The product of its digits is 480, while the sum is 24.

The square root of 1261851 is about 1123.3214143779. The cubic root of 1261851 is about 108.0610936917.

It can be divided in two parts, 1261 and 851, that added together give a palindrome (2112).

The spelling of 1261851 in words is "one million, two hundred sixty-one thousand, eight hundred fifty-one".