261041403 has 16 divisors (see below), whose sum is σ = 400222976. Its totient is φ = 148249440.

The previous prime is 261041353. The next prime is 261041423. The reversal of 261041403 is 304140162.

It is not a de Polignac number, because 261041403 - 2¹⁴ = 261025019 is a prime.

It is a super-2 number, since 2×261041403² = 136285228160416818, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

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 261041403.

It is not an unprimeable number, because it can be changed into a prime (261041423) 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, 34708 + ... + 41553.

It is an arithmetic number, because the mean of its divisors is an integer number (25013936).

Almost surely, 2^261041403 is an apocalyptic number.

261041403 is a deficient number, since it is larger than the sum of its proper divisors (139181573).

261041403 is a wasteful number, since it uses less digits than its factorization.

261041403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76434.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 261041403 is about 16156.7757612712. The cubic root of 261041403 is about 639.1014432857.

Adding to 261041403 its reverse (304140162), we get a palindrome (565181565).

The spelling of 261041403 in words is "two hundred sixty-one million, forty-one thousand, four hundred three".