261317004 has 24 divisors (see below), whose sum is σ = 656643120. Its totient is φ = 80405184.

The previous prime is 261316987. The next prime is 261317009. The reversal of 261317004 is 400713162.

261317004 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×261317004³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (261317009) 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, 837399 + ... + 837710.

It is an arithmetic number, because the mean of its divisors is an integer number (27360130).

Almost surely, 2^261317004 is an apocalyptic number.

It is an amenable number.

261317004 is an abundant number, since it is smaller than the sum of its proper divisors (395326116).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261317004 is a wasteful number, since it uses less digits than its factorization.

261317004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1675129 (or 1675127 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 261317004 is about 16165.3024716521. The cubic root of 261317004 is about 639.3262799645.

The spelling of 261317004 in words is "two hundred sixty-one million, three hundred seventeen thousand, four".