1256121 has 8 divisors (see below), whose sum is σ = 1860960. Its totient is φ = 837396.

The previous prime is 1256107. The next prime is 1256149. The reversal of 1256121 is 1216521.

It is not a de Polignac number, because 1256121 - 2⁷ = 1255993 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 1256094 and 1256103.

It is not an unprimeable number, because it can be changed into a prime (1256161) 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 7 ways as a sum of consecutive naturals, for example, 23235 + ... + 23288.

It is an arithmetic number, because the mean of its divisors is an integer number (232620).

2^1256121 is an apocalyptic number.

It is an amenable number.

1256121 is a deficient number, since it is larger than the sum of its proper divisors (604839).

1256121 is an equidigital number, since it uses as much as digits as its factorization.

1256121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46532 (or 46526 counting only the distinct ones).

The product of its digits is 120, while the sum is 18.

The square root of 1256121 is about 1120.7680402296. The cubic root of 1256121 is about 107.8972788739.

The spelling of 1256121 in words is "one million, two hundred fifty-six thousand, one hundred twenty-one".