261322275 has 12 divisors (see below), whose sum is σ = 432052952. Its totient is φ = 139371840.

The previous prime is 261322267. The next prime is 261322289. The reversal of 261322275 is 572223162.

It is not a de Polignac number, because 261322275 - 2³ = 261322267 is a prime.

It is a super-2 number, since 2×261322275² = 136578662822351250, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1742074 + ... + 1742223.

Almost surely, 2^261322275 is an apocalyptic number.

261322275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

261322275 is a deficient number, since it is larger than the sum of its proper divisors (170730677).

261322275 is a wasteful number, since it uses less digits than its factorization.

261322275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3484310 (or 3484305 counting only the distinct ones).

The product of its digits is 10080, while the sum is 30.

The square root of 261322275 is about 16165.4655052058. The cubic root of 261322275 is about 639.3305785317.

The spelling of 261322275 in words is "two hundred sixty-one million, three hundred twenty-two thousand, two hundred seventy-five".