261001004 has 24 divisors (see below), whose sum is σ = 503419728. Its totient is φ = 117411840.

The previous prime is 261000989. The next prime is 261001007. The reversal of 261001004 is 400100162.

It is a super-3 number, since 3×261001004³ (a number of 26 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 261001004.

It is not an unprimeable number, because it can be changed into a prime (261001007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26309 + ... + 34844.

It is an arithmetic number, because the mean of its divisors is an integer number (20975822).

Almost surely, 2^261001004 is an apocalyptic number.

It is an amenable number.

261001004 is a deficient number, since it is larger than the sum of its proper divisors (242418724).

261001004 is a wasteful number, since it uses less digits than its factorization.

261001004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61265 (or 61263 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 261001004 is about 16155.5254943936. The cubic root of 261001004 is about 639.0684722819.

Adding to 261001004 its reverse (400100162), we get a palindrome (661101166).

The spelling of 261001004 in words is "two hundred sixty-one million, one thousand, four".