261201053 has 2 divisors, whose sum is σ = 261201054. Its totient is φ = 261201052.

The previous prime is 261201047. The next prime is 261201067. The reversal of 261201053 is 350102162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 259951129 + 1249924 = 16123^2 + 1118^2 .

It is a cyclic number.

It is not a de Polignac number, because 261201053 - 2²⁶ = 194092189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261201253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130600526 + 130600527.

It is an arithmetic number, because the mean of its divisors is an integer number (130600527).

Almost surely, 2^261201053 is an apocalyptic number.

It is an amenable number.

261201053 is a deficient number, since it is larger than the sum of its proper divisors (1).

261201053 is an equidigital number, since it uses as much as digits as its factorization.

261201053 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 261201053 is about 16161.7156576893. The cubic root of 261201053 is about 639.2317058298.

The spelling of 261201053 in words is "two hundred sixty-one million, two hundred one thousand, fifty-three".