261749403 has 6 divisors (see below), whose sum is σ = 378082484. Its totient is φ = 174499596.

The previous prime is 261749401. The next prime is 261749441. The reversal of 261749403 is 304947162.

It is not a de Polignac number, because 261749403 - 2¹ = 261749401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261749401) 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 5 ways as a sum of consecutive naturals, for example, 14541625 + ... + 14541642.

Almost surely, 2^261749403 is an apocalyptic number.

261749403 is a deficient number, since it is larger than the sum of its proper divisors (116333081).

261749403 is a wasteful number, since it uses less digits than its factorization.

261749403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29083273 (or 29083270 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 261749403 is about 16178.6712371567. The cubic root of 261749403 is about 639.6787148786.

The spelling of 261749403 in words is "two hundred sixty-one million, seven hundred forty-nine thousand, four hundred three".