1275981 has 8 divisors (see below), whose sum is σ = 1944384. Its totient is φ = 729120.

The previous prime is 1275979. The next prime is 1276001. The reversal of 1275981 is 1895721.

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

It is not a de Polignac number, because 1275981 - 2¹ = 1275979 is a prime.

It is a super-2 number, since 2×1275981² = 3256255024722, which contains 22 as substring.

1275981 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1275931) 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, 30360 + ... + 30401.

It is an arithmetic number, because the mean of its divisors is an integer number (243048).

2^1275981 is an apocalyptic number.

It is an amenable number.

1275981 is a deficient number, since it is larger than the sum of its proper divisors (668403).

1275981 is an equidigital number, since it uses as much as digits as its factorization.

1275981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60771.

The product of its digits is 5040, while the sum is 33.

The square root of 1275981 is about 1129.5932896401. The cubic root of 1275981 is about 108.4629475582.

The spelling of 1275981 in words is "one million, two hundred seventy-five thousand, nine hundred eighty-one".