261031016 has 32 divisors (see below), whose sum is σ = 497448000. Its totient is φ = 128392320.

The previous prime is 261030983. The next prime is 261031021. The reversal of 261031016 is 610130162.

It is a super-3 number, since 3×261031016³ (a number of 26 digits) contains 333 as substring.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 185885 + ... + 187283.

It is an arithmetic number, because the mean of its divisors is an integer number (15545250).

Almost surely, 2^261031016 is an apocalyptic number.

It is an amenable number.

261031016 is a deficient number, since it is larger than the sum of its proper divisors (236416984).

261031016 is a wasteful number, since it uses less digits than its factorization.

261031016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1769 (or 1765 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 261031016 is about 16156.4543139886. The cubic root of 261031016 is about 639.0929664251.

Adding to 261031016 its reverse (610130162), we get a palindrome (871161178).

The spelling of 261031016 in words is "two hundred sixty-one million, thirty-one thousand, sixteen".