261280601 has 2 divisors, whose sum is σ = 261280602. Its totient is φ = 261280600.

The previous prime is 261280573. The next prime is 261280603. The reversal of 261280601 is 106082162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 248031001 + 13249600 = 15749^2 + 3640^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261280601 is a prime.

Together with 261280603, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (261280603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130640300 + 130640301.

It is an arithmetic number, because the mean of its divisors is an integer number (130640301).

Almost surely, 2^261280601 is an apocalyptic number.

It is an amenable number.

261280601 is a deficient number, since it is larger than the sum of its proper divisors (1).

261280601 is an equidigital number, since it uses as much as digits as its factorization.

261280601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 261280601 is about 16164.1764714445. The cubic root of 261280601 is about 639.2965912786.

The spelling of 261280601 in words is "two hundred sixty-one million, two hundred eighty thousand, six hundred one".