261001203 has 16 divisors (see below), whose sum is σ = 363224736. Its totient is φ = 166549760.

The previous prime is 261001159. The next prime is 261001229. The reversal of 261001203 is 302100162.

It is a cyclic number.

It is not a de Polignac number, because 261001203 - 2⁸ = 261000947 is a prime.

It is a super-3 number, since 3×261001203³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (261001243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13500 + ... + 26537.

It is an arithmetic number, because the mean of its divisors is an integer number (22701546).

Almost surely, 2^261001203 is an apocalyptic number.

261001203 is a deficient number, since it is larger than the sum of its proper divisors (102223533).

261001203 is a wasteful number, since it uses less digits than its factorization.

261001203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40134.

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

The square root of 261001203 is about 16155.5316532759. The cubic root of 261001203 is about 639.0686347010.

Adding to 261001203 its reverse (302100162), we get a palindrome (563101365).

The spelling of 261001203 in words is "two hundred sixty-one million, one thousand, two hundred three".