1275006861 has 6 divisors (see below), whose sum is σ = 1841676590. Its totient is φ = 850004568.

The previous prime is 1275006823. The next prime is 1275006881. The reversal of 1275006861 is 1686005721.

It can be written as a sum of positive squares in only one way, i.e., 1232431236 + 42575625 = 35106^2 + 6525^2 .

It is not a de Polignac number, because 1275006861 - 2⁹ = 1275006349 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1275006881) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 70833706 + ... + 70833723.

Almost surely, 2^1275006861 is an apocalyptic number.

It is an amenable number.

1275006861 is a deficient number, since it is larger than the sum of its proper divisors (566669729).

1275006861 is a wasteful number, since it uses less digits than its factorization.

1275006861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141667435 (or 141667432 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 1275006861 is about 35707.2382158016. The cubic root of 1275006861 is about 1084.3533876504.

The spelling of 1275006861 in words is "one billion, two hundred seventy-five million, six thousand, eight hundred sixty-one".