275249261 has 16 divisors (see below), whose sum is σ = 336203136. Its totient is φ = 219964416.

The previous prime is 275249251. The next prime is 275249291. The reversal of 275249261 is 162942572.

It is not a de Polignac number, because 275249261 - 2¹⁸ = 274987117 is a prime.

It is a super-2 number, since 2×275249261² = 151524311362092242, which contains 22 as substring.

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 (275249251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1925 + ... + 23541.

It is an arithmetic number, because the mean of its divisors is an integer number (21012696).

Almost surely, 2^275249261 is an apocalyptic number.

It is an amenable number.

275249261 is a deficient number, since it is larger than the sum of its proper divisors (60953875).

275249261 is a wasteful number, since it uses less digits than its factorization.

275249261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21748.

The product of its digits is 60480, while the sum is 38.

The square root of 275249261 is about 16590.6377514549. The cubic root of 275249261 is about 650.4921408959.

The spelling of 275249261 in words is "two hundred seventy-five million, two hundred forty-nine thousand, two hundred sixty-one".