1251081 has 36 divisors (see below), whose sum is σ = 2123212. Its totient is φ = 705024.

The previous prime is 1251071. The next prime is 1251083. The reversal of 1251081 is 1801521.

It can be written as a sum of positive squares in 6 ways, for example, as 129600 + 1121481 = 360^2 + 1059^2 .

It is not a de Polignac number, because 1251081 - 2¹⁰ = 1250057 is a prime.

It is a super-2 number, since 2×1251081² = 3130407337122, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1251083) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 33795 + ... + 33831.

2^1251081 is an apocalyptic number.

It is an amenable number.

1251081 is a deficient number, since it is larger than the sum of its proper divisors (872131).

1251081 is a wasteful number, since it uses less digits than its factorization.

1251081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90 (or 70 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 1251081 is about 1118.5173221725. The cubic root of 1251081 is about 107.7527781398.

The spelling of 1251081 in words is "one million, two hundred fifty-one thousand, eighty-one".