261430121 has 16 divisors (see below), whose sum is σ = 283392000. Its totient is φ = 240536208.

The previous prime is 261430073. The next prime is 261430151. The reversal of 261430121 is 121034162.

It is not a de Polignac number, because 261430121 - 2¹⁰ = 261429097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261430093 and 261430102.

It is not an unprimeable number, because it can be changed into a prime (261430151) 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, 61730 + ... + 65828.

It is an arithmetic number, because the mean of its divisors is an integer number (17712000).

Almost surely, 2^261430121 is an apocalyptic number.

It is an amenable number.

261430121 is a deficient number, since it is larger than the sum of its proper divisors (21961879).

261430121 is a wasteful number, since it uses less digits than its factorization.

261430121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4228.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 261430121 is about 16168.8008522586. The cubic root of 261430121 is about 639.4185156237.

Adding to 261430121 its reverse (121034162), we get a palindrome (382464283).

The spelling of 261430121 in words is "two hundred sixty-one million, four hundred thirty thousand, one hundred twenty-one".