261050121 has 10 divisors (see below), whose sum is σ = 389963882. Its totient is φ = 174033360.

The previous prime is 261050107. The next prime is 261050143. The reversal of 261050121 is 121050162.

261050121 is a `hidden beast` number, since 2 + 610 + 50 + 1 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 235192896 + 25857225 = 15336^2 + 5085^2 .

It is not a de Polignac number, because 261050121 - 2⁶ = 261050057 is a prime.

It is a super-2 number, since 2×261050121² = 136294331348229282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261050094 and 261050103.

It is not an unprimeable number, because it can be changed into a prime (261050191) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1611340 + ... + 1611501.

Almost surely, 2^261050121 is an apocalyptic number.

It is an amenable number.

261050121 is a deficient number, since it is larger than the sum of its proper divisors (128913761).

261050121 is an equidigital number, since it uses as much as digits as its factorization.

261050121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3222853 (or 3222844 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 261050121 is about 16157.0455529469. The cubic root of 261050121 is about 639.1085578970.

The spelling of 261050121 in words is "two hundred sixty-one million, fifty thousand, one hundred twenty-one".