261019436 has 12 divisors (see below), whose sum is σ = 456944880. Its totient is φ = 130463760.

The previous prime is 261019403. The next prime is 261019439. The reversal of 261019436 is 634910162.

It is a super-2 number, since 2×261019436² = 136262291939516192, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (261019439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3446 + ... + 23106.

It is an arithmetic number, because the mean of its divisors is an integer number (38078740).

Almost surely, 2^261019436 is an apocalyptic number.

It is an amenable number.

261019436 is a deficient number, since it is larger than the sum of its proper divisors (195925444).

261019436 is a wasteful number, since it uses less digits than its factorization.

261019436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22984 (or 22982 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 261019436 is about 16156.0959393041. The cubic root of 261019436 is about 639.0835156887.

Adding to 261019436 its reverse (634910162), we get a palindrome (895929598).

The spelling of 261019436 in words is "two hundred sixty-one million, nineteen thousand, four hundred thirty-six".