261251229 has 16 divisors (see below), whose sum is σ = 360276480. Its totient is φ = 168218880.

The previous prime is 261251219. The next prime is 261251251. The reversal of 261251229 is 922152162.

261251229 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-261251229 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 261251196 and 261251205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261251219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50449 + ... + 55385.

It is an arithmetic number, because the mean of its divisors is an integer number (22517280).

Almost surely, 2^261251229 is an apocalyptic number.

It is an amenable number.

261251229 is a deficient number, since it is larger than the sum of its proper divisors (99025251).

261251229 is a wasteful number, since it uses less digits than its factorization.

261251229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5540.

The product of its digits is 4320, while the sum is 30.

The square root of 261251229 is about 16163.2678935913. The cubic root of 261251229 is about 639.2726347569.

The spelling of 261251229 in words is "two hundred sixty-one million, two hundred fifty-one thousand, two hundred twenty-nine".