261123012 has 36 divisors (see below), whose sum is σ = 660554076. Its totient is φ = 86976000.

The previous prime is 261123011. The next prime is 261123029. The reversal of 261123012 is 210321162.

261123012 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 210656196 + 50466816 = 14514^2 + 7104^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (261123011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 85512 + ... + 88512.

Almost surely, 2^261123012 is an apocalyptic number.

It is an amenable number.

261123012 is an abundant number, since it is smaller than the sum of its proper divisors (399431064).

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

261123012 is a wasteful number, since it uses less digits than its factorization.

261123012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5428 (or 5423 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 261123012 is about 16159.3010987481. The cubic root of 261123012 is about 639.1680368029.

Adding to 261123012 its reverse (210321162), we get a palindrome (471444174).

The spelling of 261123012 in words is "two hundred sixty-one million, one hundred twenty-three thousand, twelve".