261218053 has 2 divisors, whose sum is σ = 261218054. Its totient is φ = 261218052.

The previous prime is 261218029. The next prime is 261218081. The reversal of 261218053 is 350812162.

It is an a-pointer prime, because the next prime (261218081) can be obtained adding 261218053 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 171688609 + 89529444 = 13103^2 + 9462^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261218053 is a prime.

It is a super-2 number, since 2×261218053² = 136469742426221618, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261218453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130609026 + 130609027.

It is an arithmetic number, because the mean of its divisors is an integer number (130609027).

Almost surely, 2^261218053 is an apocalyptic number.

It is an amenable number.

261218053 is a deficient number, since it is larger than the sum of its proper divisors (1).

261218053 is an equidigital number, since it uses as much as digits as its factorization.

261218053 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 261218053 is about 16162.2415833943. The cubic root of 261218053 is about 639.2455734402.

The spelling of 261218053 in words is "two hundred sixty-one million, two hundred eighteen thousand, fifty-three".