261353004 has 24 divisors (see below), whose sum is σ = 665262528. Its totient is φ = 79197840.

The previous prime is 261352969. The next prime is 261353009. The reversal of 261353004 is 400353162.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (261353009) 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 7 ways as a sum of consecutive naturals, for example, 989842 + ... + 990105.

It is an arithmetic number, because the mean of its divisors is an integer number (27719272).

Almost surely, 2^261353004 is an apocalyptic number.

It is an amenable number.

261353004 is an abundant number, since it is smaller than the sum of its proper divisors (403909524).

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

261353004 is a wasteful number, since it uses less digits than its factorization.

261353004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1979965 (or 1979963 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 261353004 is about 16166.4159293271. The cubic root of 261353004 is about 639.3556372698.

The spelling of 261353004 in words is "two hundred sixty-one million, three hundred fifty-three thousand, four".