261701633 has 2 divisors, whose sum is σ = 261701634. Its totient is φ = 261701632.

The previous prime is 261701617. The next prime is 261701653. The reversal of 261701633 is 336107162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135094129 + 126607504 = 11623^2 + 11252^2 .

It is a cyclic number.

It is not a de Polignac number, because 261701633 - 2⁴ = 261701617 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261701596 and 261701605.

It is not a weakly prime, because it can be changed into another prime (261701653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130850816 + 130850817.

It is an arithmetic number, because the mean of its divisors is an integer number (130850817).

It is a Proth number, since it is equal to 15973 ⋅ 2¹⁴ + 1 and 15973 < 2¹⁴.

Almost surely, 2^261701633 is an apocalyptic number.

It is an amenable number.

261701633 is a deficient number, since it is larger than the sum of its proper divisors (1).

261701633 is an equidigital number, since it uses as much as digits as its factorization.

261701633 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 261701633 is about 16177.1948433590. The cubic root of 261701633 is about 639.6397981247.

Adding to 261701633 its reverse (336107162), we get a palindrome (597808795).

The spelling of 261701633 in words is "two hundred sixty-one million, seven hundred one thousand, six hundred thirty-three".