261028601 has 4 divisors (see below), whose sum is σ = 261068112. Its totient is φ = 260989092.

The previous prime is 261028597. The next prime is 261028613. The reversal of 261028601 is 106820162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 261028601 - 2² = 261028597 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261028301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7175 + ... + 23948.

It is an arithmetic number, because the mean of its divisors is an integer number (65267028).

Almost surely, 2^261028601 is an apocalyptic number.

It is an amenable number.

261028601 is a deficient number, since it is larger than the sum of its proper divisors (39511).

261028601 is an equidigital number, since it uses as much as digits as its factorization.

261028601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39510.

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

The square root of 261028601 is about 16156.3795758827. The cubic root of 261028601 is about 639.0909955045.

Adding to 261028601 its reverse (106820162), we get a palindrome (367848763).

The spelling of 261028601 in words is "two hundred sixty-one million, twenty-eight thousand, six hundred one".