261302001 has 4 divisors (see below), whose sum is σ = 348402672. Its totient is φ = 174201332.

The previous prime is 261301993. The next prime is 261302009. The reversal of 261302001 is 100203162.

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 an interprime number because it is at equal distance from previous prime (261301993) and next prime (261302009).

It is a cyclic number.

It is not a de Polignac number, because 261302001 - 2³ = 261301993 is a prime.

It is a super-3 number, since 3×261302001³ (a number of 26 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (261302009) 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, 43550331 + ... + 43550336.

It is an arithmetic number, because the mean of its divisors is an integer number (87100668).

Almost surely, 2^261302001 is an apocalyptic number.

It is an amenable number.

261302001 is a deficient number, since it is larger than the sum of its proper divisors (87100671).

261302001 is an equidigital number, since it uses as much as digits as its factorization.

261302001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87100670.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 261302001 is about 16164.8384155240. The cubic root of 261302001 is about 639.3140445115.

Adding to 261302001 its reverse (100203162), we get a palindrome (361505163).

The spelling of 261302001 in words is "two hundred sixty-one million, three hundred two thousand, one".