261003133 has 16 divisors (see below), whose sum is σ = 279227520. Its totient is φ = 243262656.

The previous prime is 261003109. The next prime is 261003157. The reversal of 261003133 is 331300162.

It is an interprime number because it is at equal distance from previous prime (261003109) and next prime (261003157).

It is a cyclic number.

It is not a de Polignac number, because 261003133 - 2⁵ = 261003101 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261003133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261003733) 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, 385191 + ... + 385867.

It is an arithmetic number, because the mean of its divisors is an integer number (17451720).

Almost surely, 2^261003133 is an apocalyptic number.

It is an amenable number.

261003133 is a deficient number, since it is larger than the sum of its proper divisors (18224387).

261003133 is a wasteful number, since it uses less digits than its factorization.

261003133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 996.

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 261003133 is about 16155.5913850283. The cubic root of 261003133 is about 639.0702099165.

Adding to 261003133 its reverse (331300162), we get a palindrome (592303295).

The spelling of 261003133 in words is "two hundred sixty-one million, three thousand, one hundred thirty-three".