611153261 has 2 divisors, whose sum is σ = 611153262. Its totient is φ = 611153260.

The previous prime is 611153237. The next prime is 611153287. The reversal of 611153261 is 162351116.

It is an a-pointer prime, because the next prime (611153287) can be obtained adding 611153261 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 351750025 + 259403236 = 18755^2 + 16106^2 .

It is a cyclic number.

It is not a de Polignac number, because 611153261 - 2¹⁸ = 610891117 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 611153261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (611153461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305576630 + 305576631.

It is an arithmetic number, because the mean of its divisors is an integer number (305576631).

Almost surely, 2^611153261 is an apocalyptic number.

It is an amenable number.

611153261 is a deficient number, since it is larger than the sum of its proper divisors (1).

611153261 is an equidigital number, since it uses as much as digits as its factorization.

611153261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 26.

The square root of 611153261 is about 24721.5141324313. The cubic root of 611153261 is about 848.6267380283.

The spelling of 611153261 in words is "six hundred eleven million, one hundred fifty-three thousand, two hundred sixty-one".