261434425 has 48 divisors (see below), whose sum is σ = 383761152. Its totient is φ = 172972800.

The previous prime is 261434419. The next prime is 261434441. The reversal of 261434425 is 524434162.

It is not a de Polignac number, because 261434425 - 2³ = 261434417 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 658327 + ... + 658723.

It is an arithmetic number, because the mean of its divisors is an integer number (7995024).

Almost surely, 2^261434425 is an apocalyptic number.

261434425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

261434425 is a deficient number, since it is larger than the sum of its proper divisors (122326727).

261434425 is a wasteful number, since it uses less digits than its factorization.

261434425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538 (or 533 counting only the distinct ones).

The product of its digits is 23040, while the sum is 31.

The square root of 261434425 is about 16168.9339475427. The cubic root of 261434425 is about 639.4220245820.

Adding to 261434425 its reverse (524434162), we get a palindrome (785868587).

The spelling of 261434425 in words is "two hundred sixty-one million, four hundred thirty-four thousand, four hundred twenty-five".