275778961 has 4 divisors (see below), whose sum is σ = 275814000. Its totient is φ = 275743924.

The previous prime is 275778931. The next prime is 275778983. The reversal of 275778961 is 169877572.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 275778961 - 2¹⁵ = 275746193 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 275778899 and 275778908.

It is not an unprimeable number, because it can be changed into a prime (275778931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 390 + ... + 23488.

It is an arithmetic number, because the mean of its divisors is an integer number (68953500).

Almost surely, 2^275778961 is an apocalyptic number.

It is an amenable number.

275778961 is a deficient number, since it is larger than the sum of its proper divisors (35039).

275778961 is a wasteful number, since it uses less digits than its factorization.

275778961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35038.

The product of its digits is 1481760, while the sum is 52.

The square root of 275778961 is about 16606.5939012189. The cubic root of 275778961 is about 650.9091506638.

It can be divided in two parts, 2757 and 78961, that added together give a palindrome (81718).

The spelling of 275778961 in words is "two hundred seventy-five million, seven hundred seventy-eight thousand, nine hundred sixty-one".