275951561 has 2 divisors, whose sum is σ = 275951562. Its totient is φ = 275951560.

The previous prime is 275951519. The next prime is 275951563. The reversal of 275951561 is 165159572.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 235438336 + 40513225 = 15344^2 + 6365^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-275951561 is a prime.

It is a super-2 number, since 2×275951561² = 152298528036673442, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 275951563, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (275951563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 137975780 + 137975781.

It is an arithmetic number, because the mean of its divisors is an integer number (137975781).

Almost surely, 2^275951561 is an apocalyptic number.

It is an amenable number.

275951561 is a deficient number, since it is larger than the sum of its proper divisors (1).

275951561 is an equidigital number, since it uses as much as digits as its factorization.

275951561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94500, while the sum is 41.

The square root of 275951561 is about 16611.7898192820. The cubic root of 275951561 is about 651.0449157819.

The spelling of 275951561 in words is "two hundred seventy-five million, nine hundred fifty-one thousand, five hundred sixty-one".