261031004 has 24 divisors (see below), whose sum is σ = 505242528. Its totient is φ = 117218880.

The previous prime is 261030983. The next prime is 261031021. The reversal of 261031004 is 400130162.

261031004 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65912 + ... + 69759.

It is an arithmetic number, because the mean of its divisors is an integer number (21051772).

Almost surely, 2^261031004 is an apocalyptic number.

It is an amenable number.

261031004 is a deficient number, since it is larger than the sum of its proper divisors (244211524).

261031004 is a wasteful number, since it uses less digits than its factorization.

261031004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135725 (or 135723 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 261031004 is about 16156.4539426200. The cubic root of 261031004 is about 639.0929566318.

Adding to 261031004 its reverse (400130162), we get a palindrome (661161166).

The spelling of 261031004 in words is "two hundred sixty-one million, thirty-one thousand, four".