261042436 has 12 divisors (see below), whose sum is σ = 457457728. Its totient is φ = 130340232.

The previous prime is 261042409. The next prime is 261042451. The reversal of 261042436 is 634240162.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41976 + ... + 47791.

Almost surely, 2^261042436 is an apocalyptic number.

It is an amenable number.

261042436 is a deficient number, since it is larger than the sum of its proper divisors (196415292).

261042436 is a wasteful number, since it uses less digits than its factorization.

261042436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90498 (or 90496 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 261042436 is about 16156.8077292515. The cubic root of 261042436 is about 639.1022863077.

Adding to 261042436 its reverse (634240162), we get a palindrome (895282598).

The spelling of 261042436 in words is "two hundred sixty-one million, forty-two thousand, four hundred thirty-six".