261143425 has 6 divisors (see below), whose sum is σ = 323817878. Its totient is φ = 208914720.

The previous prime is 261143417. The next prime is 261143431. The reversal of 261143425 is 524341162.

261143425 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 41422096 + 219721329 = 6436^2 + 14823^2 .

It is not a de Polignac number, because 261143425 - 2³ = 261143417 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261143393 and 261143402.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5222844 + ... + 5222893.

Almost surely, 2^261143425 is an apocalyptic number.

261143425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

261143425 is a deficient number, since it is larger than the sum of its proper divisors (62674453).

261143425 is a wasteful number, since it uses less digits than its factorization.

261143425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10445747 (or 10445742 counting only the distinct ones).

The product of its digits is 5760, while the sum is 28.

The square root of 261143425 is about 16159.9327040678. The cubic root of 261143425 is about 639.1846917848.

Adding to 261143425 its reverse (524341162), we get a palindrome (785484587).

The spelling of 261143425 in words is "two hundred sixty-one million, one hundred forty-three thousand, four hundred twenty-five".