261145004 has 6 divisors (see below), whose sum is σ = 457003764. Its totient is φ = 130572500.

The previous prime is 261144997. The next prime is 261145009. The reversal of 261145004 is 400541162.

It is a super-2 number, since 2×261145004² = 136393426228320032, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (261145009) by changing a digit.

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 as a sum of consecutive naturals, namely, 32643122 + ... + 32643129.

It is an arithmetic number, because the mean of its divisors is an integer number (76167294).

Almost surely, 2^261145004 is an apocalyptic number.

It is an amenable number.

261145004 is a deficient number, since it is larger than the sum of its proper divisors (195858760).

261145004 is a wasteful number, since it uses less digits than its factorization.

261145004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65286255 (or 65286253 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 261145004 is about 16159.9815593954. The cubic root of 261145004 is about 639.1859800559.

Adding to 261145004 its reverse (400541162), we get a palindrome (661686166).

The spelling of 261145004 in words is "two hundred sixty-one million, one hundred forty-five thousand, four".