261422225 has 24 divisors (see below), whose sum is σ = 341787648. Its totient is φ = 198057600.

The previous prime is 261422179. The next prime is 261422257. The reversal of 261422225 is 522224162.

It is a de Polignac number, because none of the positive numbers 2^k-261422225 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261422194 and 261422203.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32837 + ... + 40013.

It is an arithmetic number, because the mean of its divisors is an integer number (14241152).

Almost surely, 2^261422225 is an apocalyptic number.

261422225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

261422225 is a deficient number, since it is larger than the sum of its proper divisors (80365423).

261422225 is a wasteful number, since it uses less digits than its factorization.

261422225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7265 (or 7260 counting only the distinct ones).

The product of its digits is 3840, while the sum is 26.

The square root of 261422225 is about 16168.5566764631. The cubic root of 261422225 is about 639.4120780852.

Adding to 261422225 its reverse (522224162), we get a palindrome (783646387).

The spelling of 261422225 in words is "two hundred sixty-one million, four hundred twenty-two thousand, two hundred twenty-five".